A high-pressure study of PbCO3 by XRD and Raman spectroscopy

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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 PbCO3 by XRD and Raman spectroscopy[J]. Chinese Physics C, 2013, 37(3): 038001. doi: 10.1088/1674-1137/37/3/038001
ZHANG Yu-Feng, LIU Jing, QIN Zhen-Xing, LIN Chuan-Long, XIONG Lun, LI Rui and BAI Li-Gang. A high-pressure study of PbCO3 by XRD and Raman spectroscopy[J]. Chinese Physics C, 2013, 37(3): 038001.  doi: 10.1088/1674-1137/37/3/038001 shu
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Received: 2012-04-18
Revised: 2012-06-07
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A high-pressure study of PbCO3 by XRD and Raman spectroscopy

    Corresponding author: ZHANG Yu-Feng,
    Corresponding author: LIU Jing,

Abstract: 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 ~ 7.8 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 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.

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