The pressure behavior of α cristobalite

R. T. Downs, D. C. Palmer

Research output: Contribution to journalArticle

133 Scopus citations

Abstract

Structural and volume compressibility data for two α cristobalite samples were determined by single-crystal X-ray diffraction methods at pressures up to ~1.6 GPa. As with the other silica polymorphs that have been studied at high pressure, the change of the Si-O-Si angle is correlated with the volume compressibility. The Si-O bond lengths and the O-Si-O angles remain essentially unchanged. The bulk modulus was determined to be 11.5(7) GPa with a pressure derivative of 9(2). Both crystals underwent reversible structural phase transitions in the pressure interval 1.18-1.60 GPa. -Authors

Original languageEnglish (US)
Pages (from-to)9-14
Number of pages6
JournalAmerican Mineralogist
Volume79
Issue number1-2
StatePublished - Jan 1 1994
Externally publishedYes

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology

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