Chinese Physics C > 2013, Vol. 37 > Issue(3): 038001 DOI: 10.1088/1674-1137/37/3/038001

A high-pressure study of PbCO₃by XRD and Raman spectroscopy

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Abstract：
The pressure-induced phase transitions of PbCO ₃are studied using synchrotron radiation in a diamond anvil cell at room temperature. The XRD measurement indicates that PbCO ₃with an initial phase of aragonite-type structure undergoes two phase transitions at ～ 7.8 GPa and ～ 15.7 GPa，respectively. The higher-pressure phase appearing at ～ 15.7 GPa is stable up to 51.8 GPa. The two phase transitions are further confirmed by Raman scattering up to 23.3 GPa. During the decompression process, the high-pressure phases of PbCO ₃are gradually recovered to the starting aragonite-type structure, but exhibit some hysteresis. The bulk modulus B ₀of 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 B ₀' fixed to 4.

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ZHANG Yu-Feng, LIU Jing, QIN Zhen-Xing, LIN Chuan-Long, XIONG Lun, LI Rui and BAI Li-Gang. A high-pressure study of PbCO ₃by XRD and Raman spectroscopy[J]. Chinese Physics C, 2013, 37(3): 038001. doi: 10.1088/1674-1137/37/3/038001

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Received: 2012-04-18
Revised: 2012-06-07

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沈阳化工大学材料科学与工程学院沈阳 110142

A high-pressure study of PbCO₃by XRD and Raman spectroscopy

Corresponding author:ZHANG Yu-Feng,

Corresponding author:LIU Jing,

Received Date:2012-04-18
Accepted Date:2012-06-07
Available Online:2013-03-05

Abstract:The pressure-induced phase transitions of PbCO₃are studied using synchrotron radiation in a diamond anvil cell at room temperature. The XRD measurement indicates that PbCO₃with an initial phase of aragonite-type structure undergoes two phase transitions at ～ 7.8 GPa and ～ 15.7 GPa，respectively. The higher-pressure phase appearing at ～ 15.7 GPa is stable up to 51.8 GPa. The two phase transitions are further confirmed by Raman scattering up to 23.3 GPa. During the decompression process, the high-pressure phases of PbCO₃are gradually recovered to the starting aragonite-type structure, but exhibit some hysteresis. The bulk modulusB₀of the aragonite-type structure is obtained to be 63± (3) GPa by fitting the volume-pressure data to the Birch-Murnaghan equation of states withB₀' fixed to 4.