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Structure phase transformation and equation of state of cerium metal under pressures up to 51 GPa
Institution:1.Science and Technology on Surface Physics and Chemistry Laboratory, P. O. Box No. 9-35, Huafengxincun, Jiangyou 621908, China;2.State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, China
Abstract:This study presents high pressure phase transitions and equation of states of cerium under pressures up to 51 GPa at room temperature. The angle-dispersive x-ray diffraction experiments are carried out using a high energy synchrotron x-ray source. The bulk moduli of high pressure phases of cerium are calculated using the Birch-Murnaghan equation. We discuss and correct several previous controversial conclusions, which are caused by the measurement accuracy or personal explanation. The c/a axial ratio of ε-Ce has a maximum value at about 29 GPa, i.e., c/a ≈ 1.690.
Keywords:cerium  equation of state  high pressure  phase transition  
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