Cation vacancies and possible hydrogen atom positions in Fe-bearing hydrous forsterite, Mg1.85Fe0'.14 Si0.99H0.06O4, synthesized at 13.5 GPa and 1400 °C

Yasuhiro Kudoh, Takahiro Kuribayashi, Konstantin Litasov, Eiji Ohtani

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

The crystal structure of a single crystal of synthetic Fe-bearing hydrous forsterite (Mg1.85 Fe0.14Si0.99H0.06O4) synthesized at 13.5 GPa and 1400 °C has been investigated using X-ray diffractometry. The data show a site occupancy of 96(3)%Mg + 4(1)%Fe + 0(4)%□ at the M1 site and a site occupancy of 89(3)%Mg + 8(1)%/Fe + 3(4)%□ at the M2 site, indicating that the cation vacancies at the octahedral M sites predominantly occur at the M2 site. The occupancy at the T site. was 99.0%Si(fixed) + 0(1)%Fe + 1(1)%□, indicating a small number of vacancies with no detectable Fe occupation. A comparison of the calculated bond distances and reported stretching frequencies of the polarized IR spectra shows that the most probable H atom locations are near to the edges of the MO6.

Original languageEnglish
Pages (from-to)306-310
Number of pages5
JournalJournal of Mineralogical and Petrological Sciences
Volume102
Issue number5
DOIs
Publication statusPublished - 2007 Sep 29

Keywords

  • Cation vacancy
  • Hydrogen location
  • Hydrous forsterite

ASJC Scopus subject areas

  • Geophysics
  • Geology

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