Phase transitions in PbTe under quasi-hydrostatic pressure up to 50 GPa |
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| Authors: | Yanchun Li Chuanlong Lin Hui Li Xiaodong Li |
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| Affiliation: | 1. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, People's Republic of Chinaliyc@ihep.ac.cn liuj@ihep.ac.cn;3. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Science, Beijing 100049, People's Republic of China;4. Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing, People's Republic of China |
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| Abstract: | PbTe has been investigated using synchrotron X-ray diffraction (XRD) in a diamond anvil cell under quasi-hydrostatic pressures up to 50 GPa. Upon compression to 6.6 GPa, the initial NaCl phase transforms to an intermediate phase, which is confirmed to be an orthorhombic structure with a space group Pnma. At 18.4 GPa, the intermediate Pnma phase undergoes a phase transition to the CsCl structure. The systemic analysis of the crystal structures between the NaCl and intermediate phases indicates that the structure of the Pnma phase could be derived from the distortion of the NaCl structure. The bulk modulus of the CsCl phase is B0=52(2) GPa with V0=60.8(4) Å3 and B′0=4.0 (fixed), slightly larger than the NaCl phase (B0=44(1) GPa) and the intermediate phase (B0=49(3) GPa). |
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| Keywords: | PbTe high pressure diamond anvil cell phase transition |
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