Theory of SiO2 polymorphs
Institute of Physics, Rostov State University - 344090, Rostov on Don, Russia
2 Department of Physics, University of Amiens - 33 rue Saint-Leu, 80039 Amiens, France
3 Department of Earth Science, University of Cambridge - Cambridge, CB23EQ, UK
Accepted: 6 February 1997
The ordered structures of are shown to derive from a common parent disordered BCC structure having different fractional concentrations of molecules. This result gives an insight on the pressure-induced amorphisation mechanism of α-quartz and coesite.
PACS: 61.50.Ks – Crystallographic aspects of phase transformations; pressure effects / 64.60.Cn – Order-disorder transformations; statistical mechanics of model systems / 81.30.Hd – Constant-composition solid-solid phase transformations: polymorphic, massive, and order-disorder
© EDP Sciences, 1997