A high-pressure study of PbCO_3 by XRD and Raman spectroscopy

The pressure-induced phase transitions of PbCO3 are studied using synchrotron radiation in a diamond anvil cell at room temperature. The XRD measurement indicates that PbCO3 with an initial phase of aragonite-type structure undergoes two phase transitions at ～7.8GPa and ～15.7GPa respectively. The hi...

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Published in中国物理C：英文版 no. 3; pp. 108 - 112
Main Author 张玉峰 刘景 秦振兴 林传龙 熊伦 李蕊 白利刚
Format Journal Article
LanguageEnglish
Published 2013
Subjects
XRD
体积模量
压力诱导
同步辐射
状态方程
碳酸铅
金刚石压腔
高压X射线衍射
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Summary:The pressure-induced phase transitions of PbCO3 are studied using synchrotron radiation in a diamond anvil cell at room temperature. The XRD measurement indicates that PbCO3 with an initial phase of aragonite-type structure undergoes two phase transitions at ～7.8GPa and ～15.7GPa respectively. The higher-pressure phase appearing at ～ 15.7GPa is stable up to 51.8GPa. The two phase transitions are further confirmed by Raman scattering up to 23.3GPa. During the decompression process, the high-pressure phases of PbCO3 are gradually recovered to the starting aragonite-type structure, but exhibit some hysteresis. The bulk modulus B0 of the aragonite-type structure is obtained to be 63±（3） GPa by fitting the volume-pressure data to the Birch-Murnaghan equation of states with B0 fixed to 4.
Bibliography:The pressure-induced phase transitions of PbCO3 are studied using synchrotron radiation in a diamond anvil cell at room temperature. The XRD measurement indicates that PbCO3 with an initial phase of aragonite-type structure undergoes two phase transitions at ～7.8GPa and ～15.7GPa respectively. The higher-pressure phase appearing at ～ 15.7GPa is stable up to 51.8GPa. The two phase transitions are further confirmed by Raman scattering up to 23.3GPa. During the decompression process, the high-pressure phases of PbCO3 are gradually recovered to the starting aragonite-type structure, but exhibit some hysteresis. The bulk modulus B0 of the aragonite-type structure is obtained to be 63±（3） GPa by fitting the volume-pressure data to the Birch-Murnaghan equation of states with B0 fixed to 4.
ZHANG Yu-Feng LIU Jing QIN Zhen-Xing LIN Chuan-Long XIONG Lun LI Rul BAI Li-Gang 1 Institution of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China 2 Department of Physics, South China University of Technology, Guangzhou 510640, China
XRD, Raman, phase transition, bulk modulus
11-5641/O4
ISSN:1674-1137
0254-3052