Grüneisen parameter of quartz, quartzite, and fluorite at high pressure

Boehler, R.; Skoropanov, A.S.; and, D. O'Mara; Kennedy, George C.

doi:10.1029/sp026p0441

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P(v T)=p~t(v) + P~(v) + Ptth(v T) (5)1

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1988

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“…This is expected since 0 is not very sensitive to temperature at room temperature (Kieffer 1979). 7o for quartz is reported by Boehler et al (1979) and Boehler (1982). We adopt the former authors' value since they used a fluid pressure medium rather than the nonhydrostatic solid pressure medium of the latter author.…”

Section: P(v T)=p~t(v) + P~(v) + Ptth(v T) (5)mentioning

confidence: 83%

Simple covalent potential models of tetrahedral SiO2: Applications to ?-quartz and coesite at pressure

Stixrude

Bukowinski

1988

Phys Chem Minerals

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Abstract. We present a covalent potential model of tetrahedrally coordinated SiO2. The interactions include covalent effects in the form of a Si-O bond-stretching potential, O -Si-O and Si -O -Si angle-bending potentials, and oxygen-oxygen repulsion. Calculated equations of state of c~-quartz and coesite agree well with experiment (calculated densities within 1 percent of experiment up to 6 GPa). The calculated c~-quartz-coesite transition pressure agrees with the experimental value of ~2 GPa. Furthermore, the compression mechanisms predicted by the model (i.e. pressure induced changes in Si-O bond lengths and O-Si-O and Si-O-Si angles) are accurate.

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Section: P(v T)=p~t(v) + P~(v) + Ptth(v T) (5)mentioning

confidence: 83%