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Phase relations and equation of state (EOS) of natural cinnabar (α-HgS) are investigated by high-pressure and high-temperature synchrotron x-ray powder diffraction. The unambiguous cinnabar-rocksalt structure phase boundaries are determined to be PI (GPa)=15.54- 0.014T(℃) and Pupper(GPa)= 23.84- 0.014T(℃) at 300-623K. With K1 fixed at 4, we obtain K0 = 37(4) GPa, (aK/aT)p= -0.025(2) GPaK-1, and α0 = 3.79(20) × 10-5 K-1 for the cinnabar phase of α-HgS. The (aK/aT)p and α0 of cinnabar phase are obtained for the first time. A nearly isotropic compression of cinnabar phase is observed by linear regressions. 相似文献
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