The pressure behavior of α cristobalite

Robert T Downs, D. C. Palmer

Research output: Contribution to journalArticle

123 Citations (Scopus)

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 - 1994
Externally publishedYes

Fingerprint

cristobalite
Silicon Dioxide
compressibility
Compressibility
crystal
bulk modulus
phase transition
Bond length
silica
Polymorphism
X-ray diffraction
silicon dioxide
intervals
Elastic moduli
Phase transitions
single crystals
Single crystals
Derivatives
diffraction
X ray diffraction

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

Cite this

The pressure behavior of α cristobalite. / Downs, Robert T; Palmer, D. C.

In: American Mineralogist, Vol. 79, No. 1-2, 1994, p. 9-14.

Research output: Contribution to journalArticle

Downs, RT & Palmer, DC 1994, 'The pressure behavior of α cristobalite', American Mineralogist, vol. 79, no. 1-2, pp. 9-14.
Downs, Robert T ; Palmer, D. C. / The pressure behavior of α cristobalite. In: American Mineralogist. 1994 ; Vol. 79, No. 1-2. pp. 9-14.
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