Abstract:The structure of quartz over the temperature domain (298 K, 1078 K) and pressure domain (0 GPa, 20.25 GPa) is compared to the following three hypothetical quartz crystals: (1) Ideal α-quartz with perfectly regular tetrahedra and the same volume and Si-O-Si angle as its observed equivalent (ideal β-quartz has Si-O-Si angle fixed at 155.6°).(2) Model α-quartz with the same Si-O-Si angle and cell parameters as its observed equivalent, derived from ideal by altering the axial ratio. (3) BCC quartz with a perfectly… Show more
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