| CONDENSED MATTER: STRUCTURE, MECHANICAL AND THERMAL PROPERTIES |
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Phase Transition and EOS of Cinnabar (α-HgS) at High Pressure and High Temperature |
| FAN Da-Wei1,3, ZHOU Wen-Ge1, LIU Cong-Qiang1, WAN Fang1,3, XING Yin-Suo1,3, LIU Jing2, LI Yan-Chun2, XIE Hong-Sen1 |
| 1Laboratory for Study of the Earth's Interior and Geofluids, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 5500022Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 1000493Graduate University of the Chinese Academy of Sciences, Beijing 100049 |
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FAN Da-Wei, ZHOU Wen-Ge, LIU Cong-Qiang et al 2009 Chin. Phys. Lett. 26 046402 |
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Abstract 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 Plower(GPa)=15.54-0.014T°C and Pupper(GPa)=23.84-0.014T(°C) at 300-623K. With K' fixed at 4, we obtain K0= 37(4)GPa, (∂K/∂ T)P=-0.025(2)GPaK-1, and α_{0}=3.79(20)×10-5K-1 for the cinnabar phase of α-HgS. The (K/∂T)P and α0 of cinnabar phase are obtained for the first time. A nearly isotropic compression of cinnabar phase is observed by linear regressions.
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| Keywords:
64.30.+t
61.50.Ks
81.30.Dz
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Received: 03 November 2008
Published: 25 March 2009
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| PACS: |
64.30.+t
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61.50.Ks
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(Crystallographic aspects of phase transformations; pressure effects)
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81.30.Dz
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(Phase diagrams of other materials)
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