Updated on 2025/06/10

写真a

 
XUE Xianyu
 
Organization
Scheduled update Professor
Position
Professor
External link

Degree

  • Ph.D. (Geology) ( Stanford University )

Research Interests

  • Magmalogy

  • NMR spectroscopy

  • Mineralogy

  • 鉱物学・マグマ学・NMR分光学

Research Areas

  • Natural Science / Solid earth sciences

Education

  • Stanford University   Department of Geology  

    1990.1 - 1993.3

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    Country: United States

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  • University of Alberta   Department of Geology  

    1986.9 - 1988.11

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  • Peking University   Department of Geology  

    1980.9 - 1984.7

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    Country: China

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Research History

  • Okayama University   The Institute for Planetary Materials   Director

    2018.4 - 2022.3

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  • Okayama University   The Institute for Planetary Materials   Professor

    2016.4

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  • Okayama University   Institute for Study of the Earth’s Interior   Professor

    2015.10 - 2016.3

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  • Okayama University   Institute for Study of the Earth’s Interior   Associate Professor

    2007.4 - 2015.9

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  • Okayama University   Institute for Study of the Earth’s Interior   Associate professor

    2005.4 - 2007.3

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  • Okayama University   Institute for Study of the Earth’s Interior   Associate professor

    2002.12 - 2005.3

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Professional Memberships

 

Papers

  • Unravelling the incorporation mechanisms of water in aluminous orthoenstatite: II. comprehensive 1H, 29Si and 27Al NMR measurements Reviewed

    Xianyu Xue, Masami Kanzaki, Rongzhang Yin

    Contributions to Mineralogy and Petrology   2024.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00410-024-02182-5

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  • Unravelling the incorporation mechanisms of water in aluminous orthoenstatite: I. First-principles calculations Reviewed

    Xianyu Xue, Masami Kanzaki

    Contributions to Mineralogy and Petrology   2024.12

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    Authorship:Lead author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00410-024-02171-8

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  • Correlation between Si-Al disorder and hydrogen-bonding distance variation in ussingite (Na2AlSi3O8OH) revealed by one- and two-dimensional multi-nuclear NMR and first-principles calculation Reviewed

    Xianyu Xue, Masami Kanzaki

    American Mineralogist   109 ( 5 )   858 - 871   2024.5

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)   Publisher:Mineralogical Society of America  

    DOI: 10.2138/am-2023-9008

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  • Incorporation mechanisms and infrared absorption coefficients of water in MgSiO3 orthoenstatite clarified via comprehensive NMR and vibrational spectroscopic measurements, and first-principles calculations Reviewed

    Xianyu Xue, Masami Kanzaki, Abd-Erraouf Djirar, Chris Gregson

    Contributions to Mineralogy and Petrology   2024.4

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    Authorship:Lead author   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00410-024-02114-3

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  • Experimental evidence of static disorder of carbonate ions in Ba-doped calcite

    Shiho Marugata, Hiroyuki Kagi, Yuta Ijichi, Kazuki Komatsu, Xianyu Xue, Kazumasa Sugiyama

    JOURNAL OF SOLID STATE CHEMISTRY   312   2022.8

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    DOI: 10.1016/j.jssc.2022.123258

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  • Comment on "Towards the reconciliation of viscosity change and CO2-induced polymerization in silicate melts" by Yann Morizeta, Michael Paris, David Sifre, Ida Di Carlo, Sandra Ory, and Fabrice Gaillard [Chemical Geology 458 (2017) 38-47]

    Xianyu Xue

    CHEMICAL GEOLOGY   550   2020.9

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  • Carbonate speciation in depolymerized and polymerized (alumino) silicate glasses: Constraints from C-13 MAS and static NMR measurements and ab initio calculations

    Xianyu Xue, Masami Kanzaki, Paul Floury, Tsubasa Tobase, James Eguchi

    CHEMICAL GEOLOGY   479   151 - 165   2018.2

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    DOI: 10.1016/j.chemgeo.2018.01.005

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  • Protoenstatite in MgSiO3 samples prepared by conventional solid state reaction

    Masami Kanzaki, Xianyu Xue

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   112 ( 6 )   359 - 364   2017.12

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    DOI: 10.2465/jmps.170616

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  • Crystal structures of two oxygen-deficient perovskite phases in the CaSiO3-CaAlO2.5 join

    Masami Kanzaki, Xianyu Xue, Ye Wu, Shufang Nie

    PHYSICS AND CHEMISTRY OF MINERALS   44 ( 10 )   717 - 733   2017.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00269-017-0896-z

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  • Hydrogen incorporation mechanisms in forsterite: New insights from H-1 and Si-29 NMR spectroscopy and first-principles calculation

    Xianyu Xue, Masami Kanzaki, Doreen Turner, Dominik Loroch

    AMERICAN MINERALOGIST   102 ( 3 )   519 - 536   2017.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2138/am-2017-5878

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  • Cation distribution in Mg-Zn olivine solid solution: a Si-29 MAS NMR and first-principles calculation study

    Masami Kanzaki, Xianyu Xue

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   111 ( 4 )   292 - 296   2016.8

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.2465/jmps.151104a

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  • Hydroxyl speciation in felsic magmas

    Wim J. Malfait, Xianyu Xue

    GEOCHIMICA ET COSMOCHIMICA ACTA   140   606 - 620   2014.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.gca.2014.05.017

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  • NMR Spectroscopy of Inorganic Earth Materials

    Jonathan F. Stebbins, Xianyu Xue

    SPECTROSCOPIC METHODS IN MINERALOLOGY AND MATERIALS SCIENCES   78   605 - 653   2014

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    Language:English   Publishing type:Part of collection (book)  

    DOI: 10.2138/rmg.2014.78.15

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  • Crystal structures of Zn2SiO4 III and IV synthesized at 6.5-8 GPa and 1,273 K

    Xianyu Liu, Masami Kanzaki, Xianyu Xue

    PHYSICS AND CHEMISTRY OF MINERALS   40 ( 6 )   467 - 478   2013.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1007/s00269-013-0584-6

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  • A neutron/X-ray diffraction, IR, and 1H/ 29Si NMR spectroscopic investigation of armenite: Behavior of extra framework Ca cations and H 2O molecules in microporous silicates

    Charles A. Geiger, G. Diego Gatta, Xianyu Xue, Garry J. McIntyre

    Zeitschrift fur Kristallographie   227 ( 7 )   411 - 426   2012.7

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1524/zkri.2012.1515

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  • Structural Characterization of Moganite-Type AlPO4 by NMR and Powder X-ray Diffraction

    Masami Kanzaki, Xianyu Xue

    INORGANIC CHEMISTRY   51 ( 11 )   6164 - 6172   2012.6

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/ic300167k

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  • Distinct Si-29 MAS NMR Peaks from Si-Al Permutation on Neighboring T Sites of Unequal Si-O-T Angles: Direct Evidence from J-Resolved Experiment on K-Cymrite (KAlSi3O8 center dot H2O)

    Xianyu Xue, Masami Kanzaki

    JOURNAL OF PHYSICAL CHEMISTRY C   116 ( 19 )   10714 - 10722   2012.5

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/jp3008859

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  • Raman and NMR spectroscopic characterization of high-pressure K-cymrite (KAlSi3O8 center dot H2O) and its anhydrous form (kokchetavite)

    Masami Kanzaki, Xianyu Xue, Julien Amalberti, Qian Zhang

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES   107 ( 2 )   114 - 119   2012.4

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    DOI: 10.2465/jmps.111020i

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  • A neutron/X-ray diffraction, IR, and H-1/Si-29 NMR spectroscopic investigation of armenite: Behavior of extra framework Ca cations and H2O molecules in microporous silicates

    Charles A. Geiger, G. Diego Gatta, Xianyu Xue, Garry J. McIntyre

    ZEITSCHRIFT FUR KRISTALLOGRAPHIE-CRYSTALLINE MATERIALS   227 ( 7 )   411 - 426   2012

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    DOI: 10.1524/zkri.2012.1515

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  • Structures of two new high-pressure forms of AlPO4 by X-ray powder diffraction and NMR spectroscopy

    Masami Kanzaki, Xianyu Xue, Sindy Reibstein, Eleanor Berryman, Seonyi Namgung

    ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE   67 ( 1 )   30 - 40   2011.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1107/S0108768110051050

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  • Determination of J coupling constants between spin-1/2 and quadrupolar nuclei in inorganic solids from spin echo and refocused INEPT experiments: A case study on AlPO4 berlinite

    Xianyu Xue

    SOLID STATE NUCLEAR MAGNETIC RESONANCE   38 ( 2-3 )   62 - 73   2010.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.ssnmr.2010.09.001

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  • Unique crystal chemistry of two polymorphs of topaz-OH: A multi-nuclear NMR and Raman study

    Xianyu Xue, Masami Kanzaki, Hiroshi Fukui

    AMERICAN MINERALOGIST   95 ( 8-9 )   1276 - 1293   2010.8

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    DOI: 10.2138/am.2010.3471

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  • The partial H-1 NMR spectra of Al-OH and molecular H2O in hydrous aluminosilicate glasses: Component-Resolved analysis of Al-27-H-1 cross polarization and H-1 spin-echo MAS NMR spectra

    Wim J. Malfait, Xianyu Xue

    SOLID STATE NUCLEAR MAGNETIC RESONANCE   37 ( 3-4 )   60 - 68   2010.5

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    DOI: 10.1016/j.ssnmr.2010.04.002

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  • The nature of hydroxyl groups in aluminosilicate glasses: Quantifying Si-OH and Al-OH abundances along the SiO2-NaAlSiO4 join by H-1, Al-27-H-1 and Si-29-H-1 NMR spectroscopy

    Wim J. Malfait, Xianyu Xue

    GEOCHIMICA ET COSMOCHIMICA ACTA   74 ( 2 )   719 - 737   2010.1

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.gca.2009.10.036

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  • Proton Distributions and Hydrogen Bonding in Crystalline and Glassy Hydrous Silicates and Related Inorganic Materials: Insights from High-Resolution Solid-State Nuclear Magnetic Resonance Spectroscopy

    Xianyu Xue, Masami Kanzaki

    JOURNAL OF THE AMERICAN CERAMIC SOCIETY   92 ( 12 )   2803 - 2830   2009.12

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  • Si-Al distribution in high-pressure CaAl4Si2O11 phase: A Si-29 and Al-27 NMR study

    Xianyu Xue, Shuangmeng Zhai, Masami Kanzaki

    AMERICAN MINERALOGIST   94 ( 11-12 )   1739 - 1742   2009.11

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    DOI: 10.2138/am.2009.3348

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  • Water speciation in hydrous silicate and aluminosilicate glasses: Direct evidence from Si-29-H-1 and Al-27-H-1 double-resonance NMR

    Xianyu Xue

    AMERICAN MINERALOGIST   94 ( 2-3 )   395 - 398   2009.2

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    DOI: 10.2138/am.2009.3088

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  • Dense hydrous magnesium silicates, phase D, and superhydrous B: New structural constraints from one- and two-dimensional Si-29 and H-1 NMR

    Xianyu Xue, Masaw Kanzak, Anton Shatskiy

    AMERICAN MINERALOGIST   93 ( 7 )   1099 - 1111   2008.7

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    DOI: 10.2138/am.2008.2751

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  • Structure of hydrous aluminosilicate glasses along the diopside-anorthite join: A comprehensive one- and two-dimensional H-1 and Al-27 NMR study

    Xianyu Xue, Masami Kanzaki

    GEOCHIMICA ET COSMOCHIMICA ACTA   72 ( 9 )   2331 - 2348   2008.5

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    DOI: 10.1016/j.gca.2008.01.022

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  • High-pressure delta-AI(OH)(3) and delta-A1OOH phases and isostructural hydroxides/oxyhydroxides: New structural insights from high-resolution H-1 and Al-27 NMR

    Xianyu Xue, Masami Kanzaki

    JOURNAL OF PHYSICAL CHEMISTRY B   111 ( 46 )   13156 - 13166   2007.11

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/jp073968r

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  • Al coordination and water speciation in hydrous aluminosilicate glasses: Direct evidence from high-resolution heteronuclear H-1-Al-27 correlation NMR

    Xianyu Xue, Masami Kanzaki

    SOLID STATE NUCLEAR MAGNETIC RESONANCE   31 ( 1 )   10 - 27   2007.2

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    DOI: 10.1016/j.ssnmr.2006.11.001

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  • Depolymerization effect of water in aluminosilicate glasses: Direct evidence from H-1-Al-27 heteronuclear correlation NMR

    Xianyu Xue, Masami Kanzaki

    AMERICAN MINERALOGIST   91 ( 11-12 )   1922 - 1926   2006.11

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    DOI: 10.2138/am.2006.2365

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  • Cation order and hydrogen bonding of high-pressure phases in the Al2O3-SiO2-H2O system: An NMR and Raman study

    Xianyu Xue, Masami Kanzaki, Hiroshi Fukui, Eiji Ito, Takafumi Hashimoto

    AMERICAN MINERALOGIST   91 ( 5-6 )   850 - 861   2006.5

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    DOI: 10.2138/am.2006.2064

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  • First-principles EFG calculations and application to NMR

    Kanzaki Masaim, Xue Xianyu

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2005   23 - 23   2005

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    We have calculated electric field gradients (EFG) of various crystals using FPLAPW method. Calculated Cq and asymmetry parameter of oxygen well reproduced experimental NMR data within 5 %, except for hydrogen containing systems. Therefore such calculations allow us to uniquely assign NMR peaks to certain sites with confidence.

    DOI: 10.14824/kobutsu.2005.0.23.0

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  • Cation order and hydrogen bonding of high-pressure phases in the Al2O3-SiO2-H2O system

    Xue Xianyu, Kanzaki Masami, Fukui Hiroyuki, Ito Eiji, Hashimoto Takafumi

    Abstracts for Annual Meeting of the Mineralogical Society of Japan   2005   45 - 45   2005

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    Topaz-OH (Al2SiO4(OH)2), phase egg (AlSiO3OH) and delta-AlOOH are hydrous phases in the Al2O3-SiO2-H2O system that have been found to be stable at successively higher pressures up to those of the lower mantle, and thus may be important in the siliceous sediments of subducting slab. Although the crystal structures of these phases have been determined by X-ray diffraction, this technique is insensitive to H positions and Al-Si disorder. We have applied 1H, 29Si and 27Al NMR and micro-Raman spectroscopy to gain additional insights. Our study revealed that the octahedral Al-Si distribution in phase egg is partially disordered, which is expected to have a significant effect on its physical and thermodynamic properties and stability field. In addition, these data also suggest the presence of some structural disorder in topaz-OH. Finally, our data support that hydrogen bonding is strong in phase egg and delta-AlOOH, but weak in topaz-OH.

    DOI: 10.14824/kobutsu.2005.0.45.0

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  • Structure and properties of silicate melts and fluids

    Xue, XY, Kanzaki, M, Neuville, DR, Kawamoto, T

    Geochimica Et Cosmochimica Acta   68 ( 24 )   5011 - 5011   2004

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    DOI: 10.1016/j.gca.2004.08.025

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  • Sulfur speciation and network structural changes in sodium silicate glasses: Constraints from NMR and Raman spectroscopy

    Tsujimura, T, Xue, XY, Kanzaki, M, Walter, MJ

    Geochimica Et Cosmochimica Acta   68 ( 24 )   2004

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1016/j.gca.2004.08.029

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  • Ab initio calculation of the O-17 and H-1 NMR parameters for various OH groups: Implications to the speciation and dynamics of dissolved water in silicate glasses

    Xue, XY, Kanzaki, M

    Journal of Physical Chemistry B   105 ( 17 )   2001

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    DOI: 10.1021/jp0040751

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  • An ab initio calculation of O-17 and Si-29 NMR parameters for SiO2 polymorphs

    Xue, XY, Kanzaki, M

    Solid State Nuclear Magnetic Resonance   16 ( 4 )   2000

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  • NMR characteristics of possible oxygen sites in aluminosilicate glasses and melts: An ab initio study

    Xue, XY, Kanzaki, M

    Journal of Physical Chemistry B   103 ( 49 )   10816 - 10830   1999

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1021/jp992108a

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  • Correlations between Si-29, O-17, and H-1 NMR properties and local structures in silicates: an ab initio calculation Reviewed

    Xue, X, M Kanzaki

    PHYSICS AND CHEMISTRY OF MINERALS   26 ( 1 )   14 - 30   1998.11

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  • Correlations between 29Si, 17O and 1H NMR properties and local structures in silicates - an ab initio calculation

    X. Xue, M. Kanzaki

    Phys. Chem. Mineral.   26   14 - 30   1998

  • Phase relations in Na2O-SiO2 and K2Si4O9 systems up to 14 GPa and Si-29 NMR study of the new high-pressure phases: implications to the structure of high-pressure silicate glasses

    Kanzaki, M, Xue, XY, Stebbins, JF

    Physics of the Earth and Planetary Interiors   107 ( 1-3 )   1998

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  • CORRELATIONS BETWEEN O-17 NMR PARAMETERS AND LOCAL-STRUCTURE AROUND OXYGEN IN HIGH-PRESSURE SILICATES - IMPLICATIONS FOR THE STRUCTURE OF SILICATE MELTS AT HIGH-PRESSURE

    XY XUE, JF STEBBINS, M KANZAKI

    AMERICAN MINERALOGIST   79 ( 1-2 )   31 - 42   1994.1

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  • A SI-29 MAS NMR-STUDY OF SUB-TG AMORPHIZATION OF STISHOVITE AT AMBIENT PRESSURE Reviewed

    XY XUE, JF STEBBINS, M KANZAKI

    PHYSICS AND CHEMISTRY OF MINERALS   19 ( 7 )   480 - 485   1993.2

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  • THE CRYSTAL-STRUCTURE OF A NEW HIGH-PRESSURE POLYMORPH OF NA2SI2O5 Reviewed

    BD SANTARSIERO, XY XUE, M KANZAKI

    PROCEEDINGS OF THE SYMPOSIUM ON THE STRUCTURAL CHEMISTRY OF SILICATES   27   279 - 283   1993

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  • NA-23 NMR CHEMICAL-SHIFTS AND LOCAL NA COORDINATION ENVIRONMENTS IN SILICATE CRYSTALS, MELTS AND GLASSES

    XUE, XY, STEBBINS, JF

    Physics and Chemistry of Minerals   20 ( 5 )   1993

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  • Characterization of crystalline and amorphous silicates quenched from high pressure by 29Si MAS NMR spectroscopy (共著)

    M. Kanzaki, J.F. Stebbins, X. Xue

    HIgh-Pressure Research: Application to Earth and Planetary Sciences (Y. Syono and M.H. Manghnani eds), Terra Sci. Pub./Tokyo   89 - 100   1992

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  • Characterization of crystalline and amorphous silicates quenched from high pressure by 29Si MAS NMR spectroscopy

    Kanzaki, M., Stebbins, J. F., Xue, X.

    High-Pressure Research: Application to Earth and Planetary Sciences   1992

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  • THE STRUCTURE AND DYNAMICS OF ALKALI SILICATE LIQUIDS - A VIEW FROM NMR-SPECTROSCOPY

    STEBBINS, JF, FARNAN, I, XUE, XY

    Chemical Geology   96 ( 3-4 )   1992

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  • CHARACTERIZATION OF QUENCHED HIGH-PRESSURE PHASES IN CASIO3 SYSTEM BY XRD AND SI-29 NMR

    M KANZAKI, JF STEBBINS, XY XUE

    GEOPHYSICAL RESEARCH LETTERS   18 ( 3 )   463 - 466   1991.3

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/91GL00463

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  • PRESSURE-INDUCED SILICON COORDINATION AND TETRAHEDRAL STRUCTURAL-CHANGES IN ALKALI OXIDE-SILICA MELTS UP TO 12 GPA - NMR, RAMAN, AND INFRARED-SPECTROSCOPY

    XY XUE, JF STEBBINS, M KANZAKI, PF MCMILLAN, B POE

    AMERICAN MINERALOGIST   76 ( 1-2 )   8 - 26   1991.1

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  • GEOCHEMICAL AND ISOTOPIC CHARACTERISTICS OF LITHOSPHERIC MANTLE BENEATH WEST KETTLE RIVER, BRITISH-COLUMBIA - EVIDENCE FROM ULTRAMAFIC XENOLITHS

    XUE, XY, BAADSGAARD, H, IRVING, AJ, SCARFE, CM

    Journal of Geophysical Research-Solid Earth and Planets   95 ( B10 )   1990

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  • SILICON COORDINATION AND SPECIATION CHANGES IN A SILICATE LIQUID AT HIGH-PRESSURES

    XY XUE, JF STEBBINS, M KANZAKI, RG TRONNES

    SCIENCE   245 ( 4921 )   962 - 964   1989.9

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1126/science.245.4921.962

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MISC

  • Behavior of carbonate ions in Ba-doped calcite

    Marugata Shiho, Kagi Hiroyuki, Komatsu Kazuki, Saito Ayaka, Xue Xianyu, Sugiyama Kazumasa

    Abstracts of Annual Meeting of the Geochemical Society of Japan   67   99   2020

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    Language:Japanese   Publisher:GEOCHEMICAL SOCIETY OF JAPAN  

    DOI: 10.14862/geochemproc.67.0_99

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  • Cation distribution in (Mg,Zn)2SiO4 olivine solid solution: a 29Si MAS NMR and first-principles calculation study

    Xue Xianyu, Kanzaki Masami

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2015   77   2015

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    Language:Japanese   Publisher:Japan Association of Mineralogical Sciences  

    We have applied 29Si MAS NMR together with first-principles calculation to gain new insights into the cation (Mg, Zn) distribution in (Mg,Zn)2SiO4 olivine solid solution, as well as the correlation between 29Si chemical shift and local structures associated with cation distributions. It was demonstrated that 29Si MAS NMR is capable of probing/quantifying the occupancy of cations in the M1 and M2 octahedral sites, and Zn has a preference for M1 sites. This study also revealed that cation substitutions in neighboring edge-shared octahedral sites have greater influence on the 29Si chemical shift as compared to corner-shared sites for olivine.

    DOI: 10.14824/jakoka.2015.0_77

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  • Carbonate speciation in silicate melts (glasses) : New insights from ab initio calculations and NMR measurements

    XUE Xianyu, KANZAKI Masami

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2013   37   2013.9

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    Knowledge of the dissolution mechanisms of CO2 in silicate melts/glasses is indispensible for understanding how it affects physical and thermodynamic properties. CO2 is generally known to dissolve in silicate melts/glasses as molecular CO2 and CO32- species, but how the latter groups are incorporated in the melt and its effect on the silicate structure have been less certain. Here we report ab initio calculation (vibrational frequencies, 13C chemical shift tensors) and multinuclear NMR study on 13CO2-bearing glasses of diverse silicate compositions. Our calculation suggests that both vibrational frequencies and 13C chemical shift tensor are sensitive to the local environments of carbonates. The experimental data indicate that carbonates are present dominantly as free carbonates (not bonded to tetrahedral Si/Al) in depolymerized melts, and as network carbonates (bonded to two tetrahedral Si/Al via two oxygens) in polymerized glasses. The formation of free carbonates would lead to polymerization of the silicate structure.    <br>

    DOI: 10.14824/jakoka.2013.0_35

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  • Water dissolution mechanisms in alkali silicate melts (glasses) : A ^<29>Si-^1H and ^<23>Na-^1H double-resonance NMR study

    XUE Xianyu, KANZAKI Masami

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2012   28 - 28   2012.9

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    The mechanism of water dissolution in silicate melts and glasses is an important factor governing its effects on their physical and thermodynamic properties. Our previous studies have revealed that for Ca-Mg silicate melts (glasses), both SiOH and free OH (e.g. MgOH), whose formations have opposite effects on the network structure and viscosity, are present. Whether free OH also occurs in hydrous alkali silicate systems has been controversial. Here we demonstrate from a combined 1H MAS NMR and double-resonance (29Si-1H and 23Na-1H) NMR study that water dissolves predominantly as SiOH and molecular H2O in Na silicate melts (glasses).

    DOI: 10.14824/jakoka.2012.0_27

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  • Structure and unusual ^<29>Si NMR characteristics of K-cymrite

    XUE Xianyu, KANZAKI Masami

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2011   197 - 197   2011.9

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    29Si MAS NMR is a well-established tool for quantitative characterization of the Si-Al distribution in minerals. For framework aluminosilicates, a maximum of five peaks for each crystallographically unique T site, corresponding to Si with nSi and (4-n)Al NNN neighbors (n=0 to 4; abbreviated as Si(nSi)), is commonly observed by 29Si MAS NMR. Here we report a detailed 1D and 2D 29Si MAS NMR study on a 95.65% 29Si-enriched high-pressure silicate mineral, K-cymrite (KAlSi3O8.H2O), synthesized at 5 GPa and 800˚C, which possesses a unique double-layered structure with all Si/Al distributed in one T site (Q4). It is shown for the first time that more than five 29Si MAS NMR peaks are resolved despite of only one unique T site in K-cymrite; these peaks can be attributed, through 2D J-coupling mediated NMR experiments, to Si(nSi)(n=1 to 4) in K-cymrite, with two peaks each for Si(3Si) and Si(2Si) as a result of two populations of T-O-T angles.

    DOI: 10.14824/jakoka.2011.0.193.0

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  • Raman spectroscopic characterization of K-cymrite (KAlSi_3O_<8^*>H_2O) and its anhydrous phase (kokchetavite)

    KANZAKI Masami, XUE Xianyu, AMALBERTI Julien, ZHANG Qian

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2011   56 - 56   2011.9

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    To help identification of K-cymrite (KAlSi3O8*H2O) and its anhydrous form (kokchetavite) in UHP metamorphic rocks, K-cymrite and kokchetavite are studied by Raman spectroscopy. K-cymrite is produced at 5 GPa and 800 C. Kokchetavite is made by dehydration of K-cymrite heating up to 800 C. In-situ high pressure Raman spectra of two phases are obtained using diamond anvil cell. Raman shifts of the main peak for K-cymrite and kokchetavite are 380 and 390 cm-1, respectively. Our result reveals that the previously reported K-cymrite from China (Zhang et al., AM, 2008) would be kokchetavite rather than K-cymrite. Pressure dependences of Raman shifts for main peaks for K-cymrite and kokchetavite are 4.9 and 5.6 cm-1/GPa, respectively.

    DOI: 10.14824/jakoka.2011.0.54.0

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  • Polymorphic phase transition and crystal chemistry of topaz-OH

    XUE Xianyu, KANZAKI Masami

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2010   72 - 72   2010.9

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    We have discovered a new polymorph of topaz-OH (ideal formula: Al2SiO4(OH)2) (denoted as topaz-OH II) that occurs at higher P-T conditions (13-14 GPa, 1300-1500°C) than that known thus far (denoted as topaz-OH I). The phase transition boundary has been investigated in-situ at high P-T by synchrotron X-ray diffraction, and their crystal structures characterized by powder X-ray diffraction, multi-nuclear NMR and micro-Raman spectroscopy. The crystal structure of topaz-OH II bears some similarity with those of topaz-OH I and diaspore (AlOOH), having partially occupied double edge-shared octahedral chains, and 2x1 tunnels containing partially occupied tetrahedral and octahedral sites. The phase transition from topaz-OH I to II is isochemical, and is characterized by both significant increase in the occupied octahedral/tetrahedral site ratio and disordering of cation distribution, which is rather unique from a crystal chemical point of view.

    DOI: 10.14824/jakoka.2010.0.70.0

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  • Water speciation in hydrous (alumino)silicate melts/glasses and quasi-chemical modeling

    X. Xue, M. Kanzaki, W. J. Malfait

    GEOCHIMICA ET COSMOCHIMICA ACTA   74 ( 12 )   A1165 - A1165   2010.6

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  • Structural determination of high-pressure AlPO_4 phases by NMR and powder X-ray diffraction techniques

    KANZAKI Masami, XUE Xianyu

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2009   131 - 127   2010.4

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    High-pressure quench experiments of AlPO4 revealed two new polymorphs at 6-7 GPa. "I" stabilized at 1000°C, and "II" stabilized at 1500°C. 31P MAS NMR revealed three tetrahedral P sites of equal abundances in each phase. 27Al MQ MAS NMR unveiled two octahedral and one penta-coordinated Al sites for each phase. We solved the crystal structures using the "FOX" program (direct-space searching method), using the information from NMR to constrain the number and types of polyhedra. The space group of I was P-1, whereas, that of II was P21/c. The length of a- and c-axes are similar, however, that of b-axis of II was about twice of that of I. The densities of two phases are almost the same, and are 28% larger than that of quartz phase. Both phases contain short chains made of edge-shared six Al-polyhedra which are interconnected by PO4 tetrahedra to form 3D network.

    DOI: 10.14824/jakoka.2009.0.127.0

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  • 含水ケイ酸塩メルト・ガラスにおける含水種の分布と準化学モデリング

    XUE Xianyu

    2009   132   2010.4

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  • Water speciation in hydrous silicate glasses/melts and quasi-chemical modeling

    Xue Xianyu

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2009   128 - 128   2009

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    In recent years we have made much progress in unraveling the water dissolution mechanisms in hydrous (alumino)silicate melts/glasses through the application of advanced solid-state NMR techniques. A range of compositions, including depolymerized Al-free silicate (e.g. CaO-MgO-SiO2), nominally fully polymerized aluminosilicate (SiO2-NaAlO4 join) and partially depolymerized aluminosilicate (CaMgSiO6 (diopside)-CaAl2Si2O8 (anorthite) join), have been investigated. Several types of hydroxyl species, including Si-OH, Al-OH and free OH (e.g. Mg-OH) have been revealed, in addition to molecular H2O; their relative abundances have been found to strongly depend on composition, and can be accounted for by a set of homogeneous reactions among oxygen species in a quasi-chemical model.

    DOI: 10.14824/jakoka.2009.0.128.0

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  • Multi-nuclear, multi-dimensional solid-state NMR spectroscopy as an attractive structural probe: applications to hydrous high-pressure minerals and aluminosilicate glasses

    XUE Xianyu, KANZAKI Masami

    Chikyukagaku   42 ( 4 )   133 - 155   2008

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    Knowledge of the atomic structures of Earth's materials is indispensible for the understanding/modeling of macroscopic geochemical processes. Solid-state NMR spectroscopy offers a rich variety of advanced multi-nuclear, multi-dimensional techniques that can provide not only quantitative information about local structures around different elements (isotopes), but also direct information concerning atomic connectivities. Recently, we have applied some of these techniques to unravel the structures of (1) high-pressure hydrous minerals in the MgO-SiO2-H2O and Al2O3-SiO2-H2O systems (e.g. phase egg, δ-AlOOH, phase D, superhydrous B), which represent potential water reservoirs in the Earth's mantle, and (2) hydrous (alumino) silicate glasses (quenched melts), which serve as analogs for natural magmas. For the hydrous minerals, the states of Si-Al and Si-Mg order/disorder among octahedral sites and hydrogen distribution and hydrogen-bonding distances were clearly revealed. Such information would have been difficult to obtain by any other single technique. For the hydrous aluminosilicate melts, advanced NMR techniques provided the key information needed to end a long-standing controversy concerning the water dissolution mechanisms. Some of these results are summarized here to demonstrate the usefulness and wonder of advanced solid-state NMR spectroscopy.

    DOI: 10.14934/chikyukagaku.42.133

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  • Structure of dense hydrous magnesium silicates, phase D and superhydrous B : New constraints from one- and two- dimensional ^<29>Si and ^1H NMR

    XUE Xianyu, KANZAKI Masami, SHATSKIY Anton

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences   2007   133 - 133   2007.9

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    We have applied one-dimensional (1D) 1H and 29Si MAS NMR and 1H-29Si cross-polarization (CP) MAS NMR, and 2D 1H NOESY, high-resolution 1H CRAMPS (FSLG)-MAS NMR, 1H double-quantum filtered (DQF) single-quantum (1Q) -1Q correlation MAS NMR and 1H-29Si heteronuclear correlation (HETCOR) NMR techniques to gain new insights into the structure of two phases of potential mantle water reservoir, phase D and superhydrous B. Two samples containing both phases have been synthesized from a mixture of Mg(OH)2 and SiO2 at 24 GPa and 900-1100C. For phase D, the 29Si NMR spectra contain a nearly symmetric, broad peak near -177.7 ppm, attributable to octahedral Si with a disordered local structure. The high-resolution 1H CRAMPS spectra contain a main peak near 12.6 ppm with two shoulders near 10 and 7 ppm, suggesting a disordered proton distribution, mostly with shorter hydrogen bonds than previously suggested. For superhydrous B, our 2D NMR data have clearly revealed that it contains dissimilar proton (H1-H2) pairs and one tetrahedral Si site, consistent with space group Pnn2.

    DOI: 10.14824/jakoka.2007.0.130.0

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  • Application of multi-nuclear, multi-dimensional solid-state NMR spectroscopy to minerals and melts

    Xue Xianyu

    Abstracts of Annual Meeting of the Geochemical Society of Japan   54   211 - 211   2007

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    DOI: 10.14862/geochemproc.54.0.211.0

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  • Proton distribution in high-pressure delta-Al(OH)3 and delta-AlOOH and isostructural In(OH)3 and InOOH phases: Information from High-resolution 1H CRAMPS NMR and Raman spectroscopy

    Xue Xianyu, Kanzaki Masami

    Preprints of Annual Meeting of The Ceramic Society of Japan<br> Preprints of Fall Meeting of The Ceramic Society of Japan   2007F   118 - 118   2007

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    In order to shed light on the proton distributions and order/disorder in high-pressure delta-Al(OH)3 and delta-AlOOH and isostructural In(OH)3 and InOOH phases, high-resolution 1H CRAMPS (FSLG)-MAS NMR and Raman spectroscopy have been applied. The 1H CRAMPS-MAS NMR revealed two peaks each for delta-Al(OH)3 and In(OH)3, and one each for delta-AlOOH and InOOH. These results are consistent with crystal structures refined from X-ray and/or neutron diffraction. The Raman spectra are also in general agreement with the NMR results.

    DOI: 10.14853/pcersj.2007f.0.118.0

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  • Dissolution mechanisms of water in depolymerized silicate melts: Constraints from H-1 and Si-29 NMR spectroscopy and ab initio calculations

    Xue, XY, Kanzaki, M

    Geochimica Et Cosmochimica Acta   68 ( 24 )   5027 - 5057   2004

  • The dissolution mechanism of water in alkaline earth silicate and aluminosilicate melts: One view from H-1 MAS NMR

    Xue, X, M Kanzaki

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A543 - A543   2003.9

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  • The effect of sulfate sulfur on the structure of M2O-SiO2 glasses: A Si-29 MAS NMR Raman and FT-IR study

    T Tsujimaru, Xue, X, MJ Walter, S Yamashita, M Kanzaki

    GEOCHIMICA ET COSMOCHIMICA ACTA   67 ( 18 )   A494 - A494   2003.9

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  • The dissolution mechanisms of forsterite and enstatite: Constraints from Si-29 and H-1 MAS NMR

    Xue, X, M Kanzaki, DG Fraser

    GEOCHIMICA ET COSMOCHIMICA ACTA   66 ( 15A )   A853 - A853   2002.8

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  • NMR evidence for a new water dissolution mechanism in alkaline earth silicate melts

    M Kanzaki, Xue, X

    GEOCHIMICA ET COSMOCHIMICA ACTA   66 ( 15A )   A382 - A382   2002.8

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  • Phase relations in Na2O-SiO2 and K2Si4O9 systems up to 14 GPa and 29Si NMR study of the new high-pressure phases: Implications to the structure of high-pressure silicate glasses

    M. Kanzaki, X. Xue, J.F. Stebbins

    Phys. Earth Planet. Int.   107   9 - 21   1998

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Presentations

  • 固体NMR及び第一原理計算による地球物質の構造解明:最近の進展 Invited

    薛 献宇

    第73回固体NMR・材料フォーラム  2025.6.6 

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    Event date: 2025.6.5 - 2025.6.6

    Language:Japanese   Presentation type:Oral presentation (invited, special)  

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  • Water in nominally anhydrous mantle minerals: Insights from comprehensive spectroscopic measurements and first-principles calculations Invited

    Xianyu Xue, Masami Kanzaki

    The American Ceramic Society Glass and Optical Materials Division Meeting (GOMD 2025)  2025.5.6 

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    Event date: 2025.5.4 - 2025.5.9

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • The incorporation mechanisms of water in aluminous orthoenstatite clarified via comprehensive NMR measurements and first-principles calculations

    Xianyu Xue, Masami Kanzaki, Rongzhang Yin

    Japan Association of Mineralogical Sciences Annual Meeting 2024  2024.9.14 

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    Event date: 2024.9.12 - 2024.9.14

    Presentation type:Oral presentation (general)  

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  • Water in nominally anhydrous mantle minerals: Are you seeing them all? Invited

    Xianyu Xue, Kanzaki Masami

    Japan Geoscience Union Meeting  2024.5.30 

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    Event date: 2024.5.26 - 2024.5.31

    Presentation type:Oral presentation (invited, special)  

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  • Water Incorporation Mechanisms in Nominally Anhydrous Minerals Invited

    Xianyu Xue

    Bjorn Mysen’s Retirement Symposium  2023.11.3 

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    Event date: 2023.11.2 - 2023.11.3

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  • H and Al incorporation mechanisms in stishovite: New insights from multi-nuclear NMR and first-principles calculation

    Xianyu Xue, Masami Kanzaki

    2023 Annual Meeting of Japan Association of Mineralogical Sciences (JAMS)  2023.9.16 

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    Event date: 2023.9.14 - 2023.9.16

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  • Relationship between Si-Al disorder and hydrogen bonding distance: Insight from ussingite (Na2AlSi3O8OH)

    2023.5.25 

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    Event date: 2023.5.21 - 2023.5.26

    Language:English   Presentation type:Poster presentation  

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  • Revealing cation disorder and hydrogen bonding in minerals via multi-nuclear NMR and first-principles calculation

    Xianyu Xue

    The 61st Annual Meeting of the Nuclear Magnetic Resonance Society of Japan (2022)  2022.11.9 

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    Event date: 2022.11.8 - 2022.11.10

    Language:English   Presentation type:Oral presentation (general)  

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  • Ba含有カルサイトにおける炭酸イオンの静的無秩 序状態の実験的証拠

    鍵 裕之, 丸形 詩歩, 伊地知 雄太, 小松 一生, 薛献宇, 杉山 和正

    一般社団法人日本鉱物科学会2022年年  2022.9.19 

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    Event date: 2022.9.17 - 2022.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Si-Al distribution & hydrogen bonding in ussingite (Na2AlSi3O8OH): Unraveled by multi-nuclear NMR and first-principles calculation

    Xianyu Xue

    2022.9.19 

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    Event date: 2022.9.17 - 2022.9.19

    Language:English   Presentation type:Oral presentation (general)  

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  • 含 Al-CaTiO3ペロブスカイトの構造変化2

    永井 隆哉, 高倉 直樹, 松本 洋輔, 田口 裕宇, 献宇

    一般社団法人日本鉱物科学会2022年年会  2022.9.19 

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    Event date: 2022.9.17 - 2022.9.19

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 含Al-CaTiO3ペロブスカイトの構造変化

    永井 隆哉, 高倉 直樹, 松本 洋輔, 薛 献宇

    日本鉱物科学会2021年年会  2021.9.16 

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    Event date: 2021.9.16 - 2021.9.18

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  • Behavior of carbonate ions in Ba-doped calcite

    Marugata Shiho, Kagi Hiroyuki, Komatsu Kazuki, Saito Ayaka, Xue Xianyu, Sugiyama Kazumasa

    Abstracts of Annual Meeting of the Geochemical Society of Japan  2020  GEOCHEMICAL SOCIETY OF JAPAN

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    Event date: 2020

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  • Hydrogen incorporation mechanism in synthetic katoite-grossular and natural grossular: 1H static and MAS NMR and first-principles calculation

    Goldschmidt 2017  2017 

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  • グロッシュラーとフォルステライトにおける4H=1Si置換:NMR分光法及び第一原理計算による解明

    日本鉱物科学会2016年度年会  2016 

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  • Application of High-resolution Solid-State NMR Spectroscopy to Earth And Planetary Materials

    International Symposium Misasa VI  2016 

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  • Application of High-resolution Solid-State NMR Spectroscopy to Earth And Planetary Materials

    国際シンポジウムMISASA VI “Frontiers in Earth and Planetary Materials Research: Origin, Evolution and Dynamics”  2016 

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  • Hydrogen incorporation mechanisms in forsterite: 1H NMR measurement and first-principles calculation

    Goldschmidt2016  2016 

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  • ”無水”鉱物における水の溶解機構:固体NMR及び第一原理計算による解明

    第58回固体NMR・材料フォーラム  2015 

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  • 固体NMRの無機地球物質へ応用

    岡山大学異分野融合研究育成支援事業 シンポジウム 固体NMRの利用促進と異分野連携研究展開  2015 

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  • Application of Solid-State NMR Spectroscopy to Earth And Planetary Materials: Activity Report and Future Perspective

    国際シンポジウムMISASA V “Comprehensive Exploration of the Solar System: Sample Return and Analysis”  2015 

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  • Application of Solid-State NMR Spectroscopy to Earth And Planetary Materials: Activity Report and Future Perspective

    International Symposium MISASA V  2015 

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  • CO2 speciation in Ca- and Na- aluminosilicate glasses as a function of melt polymerization: A multi-nuclear NMR study

    Goldschmidt 2014  2014 

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  • NMR crystallography of high-pressure silicate minerals and related inorganic materials

    EUROMAR2013  2013 

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  • Breakdown of a common notion for 29Si NMR of aluminosilicates: Information from J-resolved and CPMG measurements

    第51回NMR討論会  2012 

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  • Water speciation in sodium silicate glasses (quenched melts): A comprehensive NMR study

    AGU fall meeting 2012  2012 

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  • アルカリケイ酸塩メルト(ガラス)におけ る水の溶解機構

    日本鉱物科学会2012年度年会  2012 

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  • K-cymriteの構造と特異な29Si NMR特徴

    日本鉱物科学会年会  2011 

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  • Crystal structures of three new AlPO4 high-pressure phases from powder X-ray diffraction, NMR and first principles calculations, and their unique J-coupling characteristics

    第50回NMR討論会:記念国際シンポジウム  2011 

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  • K-cymrite (KAlSi3O8.H2O)とその無水相のラマン分光

    日本鉱物科学会年会  2011 

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  • アルミノ珪酸塩相のSi-29 NMR 特徴:J結合を利用した測定から見た意外な一面

    第50回 固体NMR・材料フォーラム  2011 

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  • Water speciation in hydrous (alumino)silicate melts/glasses and quasi-chemical modeling

    Goldschmidt 2010  2010 

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  • Topaz-OHの相転移と結晶化学的特徴

    日本鉱物科学会年会  2010 

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  • 新しいAlPO4高圧相における高分解能NMRと粉末X線回折による構造決定及び31P-27Alと31P-31P間のJ結合を用いたNMRピークの帰属 2010年5月10日 oral

    第47回 固体 NMR・材料フォーラム  2010 

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  • 含水珪酸塩ガラス/メルトのおける含水種の分布と準化学モデリング

    日本鉱物科学会年会  2009 

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  • NMRと粉末X線回折法によるAlPO4高圧相の構造解析

    日本鉱物科学会年会  2009 

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  • Structures of high-pressure hydrous minerals and aluminosilicate melts (glasses): Insights from one- and two-dimensional NMR spectroscopy

    第3回COE-21三朝国際シンポジウムMisasa-III "Origin, Evolution and Dynamics of the Earth,  2008 

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  • Structures of high-pressure hydrous minerals: Insights from one- and two dimensional NMR spectroscopy

    4th Asian Conference on High Pressure Research  2008 

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  • (逆検知)27Al→1H及び1H→29Si→1H CPMAS NMR法による含水ケイ酸塩・アルミノ珪酸塩ガラス中の含水種の解明

    第44回 /9回の固体 NMR・材料フォーラム  2008 

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  • Proton distributions in high-pressure hydrous phases in the Al2O3-SiO2-H2O system: New insights from high-resolution 1H NMR spectroscopy

    Frontiers in Mineral Sciences 2007  2007 

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  • 1・2次元高分解能1Hと27Al NMRによる各種低圧・高圧オキシ水酸化物・水酸化物相の構造解明

    第42回 /7回の固体 NMR・材料フォーラム  2007 

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  • 高圧含水鉱物中の水素とSi-Mg-Al分布の秩序性:高度なNMR分光法による情報

    第48回高圧討論会, 2007年11月20日-22日、倉吉 * 薛 献宇・神崎 正美 (2007) 2007年11月20日、Oral, 1B11  2007 

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  • 多核種・多次元固体NMR分光法の鉱物・メルトへの応用

    日本地球化学会2007年度年会  2007 

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  • 高圧含水マグネシウムケイ酸塩D相及びsuperhydrous B相の構造:1・2次元1H、29Si NMRによる情報

    日本鉱物科学会2007年度年会  2007 

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  • Structure of hydrous silicate and aluminosilicate melts (glasses): Insights from one- and two-dimensional 1H and 27Al NMR

    Frontiers in Mineral Sciences 2007  2007 

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  • 高圧delta-Al(OH)3とdelta-AlOOH相及び同一構造 型In(OH)3とInOOH相中の水素:高分解能1H CRAMPS NMRとRaman分光法からの情報

    日本セラミックス協会 第20回秋季シンポジウム  2007 

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  • 含水ケイ酸塩・アルミノ珪酸塩メルト(ガラス)の構造解明:1次元及び2次元 1H 、 27Al NMRによる総合的アプローチ

    第4回強磁場固体NMRフォーラム/第39回固体 NMR・材料研究会 合同研究会  2006 

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  • Structure of hydrous aluminosilicate melts (glasses): ending a long-standing controversy by 1H-27Al HETCOR and 3QMAS/HETCOR NMR

    第45回NMR討論会  2006 

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  • Structure of hydrous (alumino)silicate melts (glasses): the end of a long-standing controversy

    国際シリケートメルトワークショップ  2006 

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  • Dissolution mechanisms of water in depolymerized aluminosilicate melts (glasses): a comprehensive one- and two-dimensional 1H, 29Si and 27Al NMR study

    19th General Meeting of the International Mineralogical Association (IMA),  2006 

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  • Cation order and hydrogen bonding of d-AlOOH, phase egg and aluminous stishovite: An NMR and Raman study

    19th General Meeting of the International Mineralogical Association (IMA),  2006 

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  • topaz-OH(Al2SiO4(OH)2)の高圧相:構造とNMR/Raman 分光による特徴

    日本地球惑星科学連合2006年大会  2006 

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  • High-pressure form of topaz-OH: Structure and characterization by NMR and Raman

    19th General Meeting of the International Mineralogical Association (IMA),  2006 

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  • 第一原理EFG計算とNMRへの応用

    日本鉱物学会年会  2005 

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  • 29Si and 27Al NMR characteristics of octahedral Si-Al disorder in high-pressure aluminosilicate minerals

    第44回NMR討論会-第1回アジア太平洋NMRシンポジウム合同会議,  2005 

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  • Al2O3-SiO2-H2O 系高圧相のカチオン秩序及び水素結合

    日本鉱物学会年会  2005 

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  • ナトリウムケイ酸塩メルトに対するいくつかの硫黄溶解機構;ラマンおよび29Si MAS NMR分光法

    地球惑星科学関連学会2004年合同大会  2004 

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  • Energetics, and vibrational and NMR characteristics of possible sulfur species in silicate melts: An ab initio calculation

    地球惑星科学関連学会2004年合同大会  2004 

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  • STABILITY AND NMR CHARACTERISTICS OF POSSIBLE SULUR SPECIES IN SILICATE MELTS AND GLASSES: AN AB INITIO CALCULATION

    XX International Congress on Glass  2004 

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  • The dissolution mechanism of water in alkaline earth silicate and aluminosilicate melts: One view from 1H MAS NMR

    地球惑星科学関連学会2004年合同大会  2004 

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  • Mg2SiO4リングウッダイト及びワーズレアイトに関する予備的29Si MAS NMR研究

    地球惑星科学関連学会2003年合同大会  2003 

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  • Effect of sulfate sulfur on structure of Na2O-SiO2 glasses; 29Si MAS NMR, Raman and FT-IR studies

    13th Annual V.M. Goldschmidt Conference,  2003 

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  • 含硫酸アルカリ珪酸塩ガラスの珪酸塩陰イオン(Qn種)分布:ラマンおよび29Si MAS NMR

    地球惑星科学関連学会2003年合同大会  2003 

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  • The dissolution mechanism of water in alkaline earth silicate and aluminosilicate melts: One view from 1H MAS NMR

    13th Annual V.M. Goldschmidt Conference,  2003 

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  • 29Si及び1H MAS NMRから見たケイ酸塩メルトにおける水の溶解機構の組成依存性

    地球惑星科学関連学会2002年合同大会  2002 

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  • NMR evidence for a new water dissolution mechanism in alkaline earth silicate melts

    12th Annual V.M. Goldschmidt Conference  2002 

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  • NMR分光法によるイオウを含むNa2O-SiO2系ガラスのネットワーク縮重合

    地球惑星科学関連学会2002年合同大会  2002 

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  • The dissolution mechanisms of forsterite and enstatite: Constraints from 29SI and 1H MAS NMR

    12th Annual V.M. Goldschmidt Conference  2002 

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  • Mg2SiO4フォルステライトの溶解機構: 29Si及び1H MAS NMRによる制約

    地球惑星科学関連学会2002年合同大会  2002 

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  • 非経験的分子軌道法による含水珪酸塩中のOH基のO-17, H-1,及びH-2 NMRパラメータの計算

    地球惑星科学関連学会2001年合同大会  2001 

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  • The effect of sulfur on silicate network structure in sodium silicate glasses

    International Symposium, Transport of Materials in the Dynamic Earth  2001 

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  • Ab Initio Calculation of the 17O and 1H NMR Parameters for Various OH Groups in Hydrous Silicates

    International Symposium, Transport of Materials in the Dynamic Earth  2001 

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  • NMR Evidence for a New Water Dissolution Mechanism in Depolymerized Silicate Melts: Results for Hydrous Diopside Composition

    International Symposium, Transport of Materials in the Dynamic Earth  2001 

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  • 縮重度の低いケイ酸塩メルトにおける水の新しい溶解機構 含水ダイオプサイドガラスのNMR結果

    地球惑星科学関連学会2001年合同大会  2001 

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  • 非経験的分子軌道法計算によるシリコン,酸素NMRパラメータの予測

    地球惑星科学関連学会2000年合同大会  2000 

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  • 含水珪酸塩ガラス中のOH基のNMR特徴:非経験的分子軌道法計算

    地球惑星科学関連学会2000年合同大会  2000 

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Research Projects

  • OH defects in mantle minerals: A study using advanced NMR spectroscopy and first-principles calculation

    Grant number:17H01174  2017.04 - 2021.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    Xue Xianyu

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    Grant amount:\46800000 ( Direct expense: \36000000 、 Indirect expense:\10800000 )

    Water may be present in nominally anhydrous mantle minerals in the form of OH defects, affecting the structure and dynamics of the Earth’s mantle. Thus, it is important to clarify how water is incorporated in such minerals. In this study, we have used a combined approach of NMR spectroscopy, first-principles calculation, etc. on a number of mantle minerals (enstatite, grossular, pyrope, ringwoodite, etc.), either synthesized at high pressure and high temperature or natural samples, and have revealed new insights into the incorporation mechanisms of OH defects in these minerals.
    In addition, we have also carried out a comparative study on Zn silicate system in an attempt to understand how the behaviors of hydrogen in high-pressure minerals vary with cation type. We have found a new high-pressure hydrous Zn silicate phase (Zn-phase A) and have determined its crystal structure.

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  • Unraveling the structure of CO2- and H2O-bearing silicate melts

    Grant number:23244105  2011.04 - 2014.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    XUE Xianyu, KANZAKI Masami

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    Grant amount:\32370000 ( Direct expense: \24900000 、 Indirect expense:\7470000 )

    In order to unravel the structure of H2O- and CO2- bearing silicate melts, we have synthesized silicate glasses of a range of compositions using piston cylinder apparatus and internally heated gas pressure vessel, and have characterized them by various NMR techniques as well as Raman spectroscopy. Quantum chemical calculations were also performed to assist data interpretation. This study has provided new insights into the compositional dependency of H2O and CO2 dissolution mechanisms in silicate melts. It was confirmed that CO2 is dissolved in depolymerized silicate melts dominantly as free carbonates, i.e. carbonate species not linked to the silicate network, and dominantly as network carbonates and molecular CO2 in fully polymerized silicate melts.

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  • Unraveling the structure of water-bearing mantle minerals by multi-nuclear and multi-dimensional NMR spectroscopy

    Grant number:19204053  2007 - 2010

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    XUE Xianyu, KANZAKI Masami, ITO Eiji

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    Grant amount:\46280000 ( Direct expense: \35600000 、 Indirect expense:\10680000 )

    In this research program, we have unraveled the detailed structure (water content and speciation, cation order/disorder, defect, etc) for a number of important water-bearing mantle minerals and related compounds using advanced multi-nuclear and multi-dimensional NMR spectroscopy. We have also discovered several new high-pressure phases and have determined their crystal structures. Such information is indispensible for understanding the physical properties of minerals at the earth's interior and for modeling the dynamics and evolution of the earth.

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  • Multi-faceted approaches for understanding local structures of silicate melts/fluids under pressure and temperature

    Grant number:19340163  2007 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANZAKI Masami, SYUE Syanu

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    Grant amount:\15600000 ( Direct expense: \12000000 、 Indirect expense:\3600000 )

    地球及び惑星内部のマグマ等の流体の構造を解明するために本研究を行った. 核磁気分光法を駆使することにより含水アルミニウムケイ酸塩メルトへの水の溶解機構を解明した. また高圧装置を使ったその場実験により, 圧力および温度とともにメルト又はガラスの構造がどのように変化するかについて様々な分光法を用いて研究を行い, 配位数変化や構造種の分布, 水酸基の構造変化についてのより詳しい情報を得る事ができた.

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  • An Experimental Study on Early Evolution of the Earth and the Structure of the Lower mantle

    Grant number:17204048  2005 - 2007

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    ITO Eiji, KATSURA Tomoo, YONEDA Akira, KANZAKE Masami, XUE Xianyu, YAMAZAKI Daisuke

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    Grant amount:\49530000 ( Direct expense: \38100000 、 Indirect expense:\11430000 )

    We have continued experiments to generate higher pressures using the Kawai-cell equipped with sintered diamond anvils at synchrotron Spring-a The generated pressure reached 85 GPa at room temperature and 87 GPa at 1000 K on the Anderson et a〓s au male Based on these innovations of experimental techniques, we have systematically examined the penovskite (Pv) -postperovskite (PPv) transformation in MgGeO_3 up to 74 GPa and 1900 K. The starting material was a fine mixture of MgGeO_3 ilmenite + 0.1 Au (in weight), which was directly loaded in a cylindrical TiB_2 heater set with a thin W/W-Re thermocouple at the center of a mall octahedral pressure medium of MgO +0.05Cr_2O_3 (in weight). Pressure value was determined form measured volume of Au from the Anderson at a〓s scale. The transformation from Pv to PPv was first confirmed at 63.2 GPa and 1323 K. Then we tried to observe the reversal reaction by decreasing pressure and keeping temperature constant Growth of Pv was not recognized until pressure went down to 60.5 GPa., suggesting the reversal reaction to be fitly sluggish The second transformation to PPv from the reversed Pv was observed at 62.8 GPa and 1473 K by heating. In the next run, it was found that well crystalline Pv persisted to pressures much higher than the expected Pv-PPv phase boundary, and growth of PPv was first recognized at 74 Gpa and 1873 K Taking the slow reaction rate in to consideration, we observed the growth of the Pv and PPv and the coexistence of both the phases in the 3rd nut The run. The phases boundary thus determined is expressed by the equation; T (K) = 191.2P (Gpa) -10563. If dP/dT slope of the phase boundary obtained in the present study for MgGeO_3 were applicable to the Pv-PPv transformation in the mantle, the PPv would be suppressed to the bottom the lower mantle, and on called PPv lens may not form. We have also pointed out that the establishment of reliable pressure scale is urgent issue of high pressure Earth science.
    In order to overcome faults of the DIA type press in squeezing the Kawai-cell, we have developed a new 6-axis apparatus in which movement of the six anvils are controlled by the high tech servo mechanism. It is possible to keep the Ka wai-cell cubic within accuracy of ± 2 μm. Pressure generation using sintered diamond cubic anvils was carried out up to ca. 60 GPa by measuring electrical resistance of GaP, Zr, and Fe_2O_3. The results are compared with the previous calibration performed at Spring-8 by means of in situ X-ray observation. It is demonstrated that significant amount of applied load is balanced with frictional force in the DIA type press. The load loss amounts to 45 % at ca. 60 Gpa.
    Electrical conductivity of wadsleyite and ringwoodite with composition of (Mg〓Fe0.1)_2SiO_4 was measured up to 20 Gpa and 2000K under both anhydrous and hydrous conditions. Measurement over the wide temperature range made it possible to determine the parameters for hopping and proton conduction mechanisms for both the materials. These results imply that electrical conductivity of the mantle transition zone (depths from 410 to 660 km) determined by the geomagnetic measurement is well reconciled anhydrous wadsleyite and ringwoodite and hypothesis of wet transition zone is ruled out.

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  • Unraveling the structure of high-pressure hydrous silicate melts by multi-dimensional NMR spectroscopy and ab intio calculations

    Grant number:17340164  2005 - 2006

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    XUE Xianyu, KANZAKI Masami

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    Grant amount:\12800000 ( Direct expense: \12800000 )

    The purpose of this study was to unravel the structure of hydrous (alumino)silicate melts (glasses) at high pressure in order to understand the behavior of natural magmas. The main achievements are outlined below:
    1.Development of multi-nuclear, multi-dimensional NMR techniques. Multi-dimensional NMR techniques are particularly powerful structural tools because of the direct information they provide about atomic connectivities. We have succeeded in a variety of NMR measurements including ^1H DQ (double quantum) MAS NMR, ^<27>Al 3Q (triple quantum) MAS NMR, and ^<27>Al-^1H HETCOR (heteronuclear correlation) and 3QMAS/HETCOR NMR.
    2.Settling a long-term controversy concerning the water dissolution mechanism in polymerized aluminosilicate melts. By using above techniques, we have confirmed that the dissolution of water in polymerized aluminosilicate melts results in the depolymerization of the network structure through formation of SiOH/AlOH.
    3.Unraveling the compositional dependency of water dissolution mechanisms in aluminosilicate melts. Our systematic study over a range of compositions, coupled with ab intio calculations, has revealed that the dissolution of water in (alumino)silicate melts/glasses involves two competing processes : (1) formation of SiOH/AlOH and depolymerization of the network structure, and (2) formation of free OH and polymerization of the network structure, with the latter favored by depolymerized compositions with cations of large field strength. Four-, five-and six-coordinate Al were found to coexist in hydrous Ca-and Mg-aluminosilicate glasses.
    4.NMR study of high-pressure hydrous minerals. A similar study was also carried out on high-pressure hydrous minerals. This is not only important for understanding the structures of mantle minerals themselves, but also provided insights into the high-pressure behavior of hydrous melts/glasses.
    5.Development of synthesis method for ^<17>O-enriched oxides. We have succeeded in synthesizing ^<17>O-enriched oxides with high yield. This is essential for ^<17>O NMR measurements on high-pressure materials of limited quantity.

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  • Structure of volatile-containing silicate melts by multi-nuclear and multi-quantum NMR spectroscopy

    Grant number:14340163  2002 - 2003

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (B)

    KANZAKI Masami, XUE Xianyu

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    Grant amount:\14700000 ( Direct expense: \14700000 )

    1.Structure of hydrous glasses : In order to investigate water dissolution mechanisms in silicate melts, we have studied hydrous melts in CaO-MgO-SiO_2 system using-^<29>Si and ^1H MAS NMR and ^1H-^<29>Si CP MAS NMR. We found free OH as well as SiOH and H_2O in these melts. Free OH was not observed in previous studies which are conducted on silica-rich melts. There is systematic changes in abundance of free OH with Mg/Ca and M/Si ratio. From these results, we suggest that free OH could be important in natural ultramafic magmas.
    2.Structure of sulfur-bearing glasses : In order to study how sulfur dissolves in silicate melts, S-bearing glasses were studied by ^<29>Si MAS NMR and micro-Raman spectroscopy. We synthesized sodium silicate glasses containing sulfur of different valence states (S^0〜S^<6+>). When native S is added, melt structure was polymerized, whereas slightly less polymerized when sulfate is added. No detectable Si-S linkages are found.
    3.Ab initio calculation of chemical shifts : Using molecular orbital theory, we have calculated wide varieties, of silicate, clusters relevant to melt or glass structures with volatile components. Calculated shifts of^1H and ^<29>Si NMR in hydrous systems support our assignment of free OH observed in the NMR spectra. Similar calculations for NMR and also vibrational spectra help us to identify sulfur species in the sulfur-containing melts.

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  • Study on local structure of silicate perovskites by NMR spectroscopy

    Grant number:11304036  1999 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research  Grant-in-Aid for Scientific Research (A)

    KANZAKI Masami, KATSURA Tomoo, ITO Eiji, XUE Xianyu

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    Grant amount:\38930000 ( Direct expense: \38600000 、 Indirect expense:\330000 )

    The results are summarized below.
    1. Setup of NMR spectrometer: We have introduced a 400MHz solid MAS NMR spectrometer to our institute. Now routine measurements of MAS NMR for ^<29>Si, ^<27>Al, ^<23>Na, ^1H etc are possible. New probe introduced in 2001 allows us to study low frequency nuclei such as ^<25>Mg, and to conduct multi-quantum NMR experiments. The instrument is now open to external researchers for cooperative research projects.
    2. Ab initio calculation of chemical shifts: Using molecular orbital technique, we have calculated wide varieties of silicate clusters relevant to melt or glass structures. Calculated shifts well reproduced observed chemical shifts. In order to better assignments of NMR spectra, we also calculated experimentally not-well characterized local structures, such as Al triclusters.
    3. First-principles calculation of electric field gradient (EFG): In order to predict EFG at quadrupolar nuclei such as Al in minerals, first-principles calculations have been conducted. Large EFG in Ca_2Al_2O_5 oxygen-defected perovskite was predicted. For example.
    4. Structure of hydrous glasses: In order to investigate water and silicate melt interaction, we have studied hydrous melts using ^<29>Si and ^1H MAS NMR and ^1H-^<29>Si CP MAS NMR. The result shows that water causes melt structure polymerize. This is contrary to common observation, and is very important discovery.
    5. Structure of sulfur-bearing glasses: In order to see how sulfur dissolves in silicate melts, S-bearing glasses were studied by ^<29>Si MAS NMR. When sulfur is added as native S, melt structure was polymerized.
    6. Hydration of minerals: Hydration processes of forsterite, enstatite and diopside have studied using ^<29>Si and ^1H MAS NMR. We observed polymerization in hydration layer in all systems studied.
    7. Crystal chemistry of water-silicate interaction: From these studies, we have gained better crystal chemical insights of the interaction between water and silicate.

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