Equation of State and Phase Diagram of Quartz

Petrovtsev, A. V.; Dremov, V. V.; Vildanov, V. G.; Gorshkov, M. M.; Zahikin, V. T.; Zhugin, Yu. N.

doi:10.1002/chin.200648221

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Equation Of State1

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2021

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“…The thermodynamic properties of quartzite are described by a multiphase EOS [1] which includes three main phases: alpha-quartz, stishovie, and liquid quartz. The position of the α-quartz-stishovite equilibrium line (Figure 1) is determined from experiments with shocked quartzite unloading into buffer materials.…”

Section: Equation Of Statementioning

confidence: 99%

Simulation of phase transitions and strength evolution in quartzite in shock experiments

et al. 2021

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Quartzite is a basic rock constituent. It has a complicated phase diagram where besides a low-pressure phase (α-quartz), two high-pressure solid ones are present – coesite and stishovite. Also present are the hightemperature cristobalite and tridymite phases with very small stability regions. In shock experiments, the transition to coesite almost never realizes and the transition from α-quartz to stishovite proceeds in a strongly nonequilibrium regime characterized by metastability and a long transition time. Quartzite is polycrystalline quartz with small amounts of impurities. The paper describes experiments with samples of Pervouralsk quartzite with mass fractions of SiO2 above 96%.

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Section: Equation Of Statementioning

confidence: 99%