論文

査読有り
2014年

Letter. Crystal chemistry of dense hydrous magnesium silicates: The structure of phase H, MgSiH2O4, synthesized at 45 GPa and 1000 °C

American Mineralogist
  • L. Bindi
  • ,
  • M. Nishi
  • ,
  • J. Tsuchiya
  • ,
  • T. Irifune

99
8-9
開始ページ
1802
終了ページ
1805
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.2138/am.2014.4994

The crystal structure of the dense hydrous magnesium silicate phase H, MgSiH2O4, synthesized at 45 GPa and 1000 °C, was investigated by single-crystal X-ray diffraction. Although showing a deterioration process under the X-ray beam, the compound was found to be orthorhombic, space group Pnnm (CaCl2-type structure), with lattice parameters a = 4.733(2), b = 4.3250(10), c = 2.8420(10) Å, V = 58.18(3) Å3, and Z = 1. The structure was refined to R1= 0.0387 using 53 observed reflections [2s(I) level]. Magnesium and silicon were found to be disordered at the same octahedral site (with a mean bond distance of 1.957 Å). Hydrogen was not located in the difference Fourier maps, but it is very likely disordered at a half-occupied 4g position. The centrosymmetric nature of the structure of phase H is examined in relation to that reported for pure d-AlOOH at ambient conditions (non-centrosymmetric, P21nm), and the possibility that these two compounds can form a solid solution at least at high pressure is discussed.

リンク情報
DOI
https://doi.org/10.2138/am.2014.4994
Scopus Url
http://www.scopus.com/inward/record.url?eid=2-s2.0-84907000570&partnerID=MN8TOARS
URL
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84907000570&origin=inward
ID情報
  • DOI : 10.2138/am.2014.4994
  • ISSN : 0003-004X
  • ORCIDのPut Code : 49519601
  • SCOPUS ID : 84907000570

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