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 language | English (US) |
|---|---|
| Pages (from-to) | 9-14 |
| Number of pages | 6 |
| Journal | American Mineralogist |
| Volume | 79 |
| Issue number | 1-2 |
| State | Published - 1994 |
ASJC Scopus subject areas
- Geophysics
- Geochemistry and Petrology