Pressure-induced H bonding: neutron diffraction study of brucite, Mg(OD)2, to 9.3 GPa

J. B. Parise, K. Leinenweber, D. J. Weidner, Tan Kemin Tan, R. B. Von Dreele

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147 Scopus citations

Abstract

The structure of deuterated brucite has been refined using Rietveld analysis of neutron powder diffraction data collected in an opposed-anvil high-pressure (Paris-Edinburgh) cell from 0.4 to 9 GPa. On the basis of bond length changes obtained from the structure refinements, H bonding between the octahedral layers becomes more significant as the unit cell contracts. The c axis is approximately two times as compressible as the a axis in this pressure range, and the compression along c is largely taken up by a 13% reduction of the interlayer spacing. The O-D bond length, on the other hand, remains nearly constant or increases slightly over the pressure range. The position of D was modeled as a threefold split site of one-third occupancy each. -from Authors

Original languageEnglish (US)
Pages (from-to)193-196
Number of pages4
JournalAmerican Mineralogist
Volume79
Issue number1-2
StatePublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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