摘要: An equation of state has been developed for quartz, a substance with lambda-type phase transition. It the properties Murnaghan in normal region and reflects fundamental behavior thermodynamic functions anomalous region. The term jT/(i-T)1/2 introduced temperature dependent equations isobaric heat capacity volume coefficient thermal expansion, where i j are fitting coefficients. is numerically close to transition Tc usually 0.1<|i-Tc|<20 K interval. range applicability delineated PT stability field quartz. In lambda range, derivative expansion respect pressure according rules that allow integration molar calculation change from room any given pressure. Available equilibria thermochemical data have used proposed calculate standard coesite SiO2 diagram including alpha beta coesite.
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