Perovskite (Pbnm) structures transformations at high pressure

  • Perovskite type compounds of general formula ABX3 have the most commonly adopted structure (Pbnm),to some extent distorted from the ideal structure Pm3m.Their structures transformations are diverse at high pressure.Three parameters (t,VA/VB,Etot),which are used to describe the stabilization of perovskite structures,are introduced briefly.Applied threeparameters,all models of perovskite structure (Pbnm) changing at high pressure are summed up.Some of the models suit all perovskites structures.As an example,CaTiO3 (Pbnm) structure changing at high pressure is analyzed by applying several models and qualitatively draws a conclusion that the structure symmetry is reduced with enhancing the pressure.
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WU Xiang, QIN Shan, WU Zi-Yu, DONG Yu-Hui, LIU Jing and LI Xiao-Dong. Perovskite (Pbnm) structures transformations at high pressure[J]. Chinese Physics C, 2003, 27(S1): 72-76.
WU Xiang, QIN Shan, WU Zi-Yu, DONG Yu-Hui, LIU Jing and LI Xiao-Dong. Perovskite (Pbnm) structures transformations at high pressure[J]. Chinese Physics C, 2003, 27(S1): 72-76. shu
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Received: 2003-11-21
Revised: 1900-01-01
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Perovskite (Pbnm) structures transformations at high pressure

    Corresponding author: WU Xiang,
  • Beijing Synchrotron Radiation Facility,Institute of High Energy Physics,CAS,Beijing 100039,China2 Department of Geology,Peking University,Beijing 100871,China

Abstract: Perovskite type compounds of general formula ABX3 have the most commonly adopted structure (Pbnm),to some extent distorted from the ideal structure Pm3m.Their structures transformations are diverse at high pressure.Three parameters (t,VA/VB,Etot),which are used to describe the stabilization of perovskite structures,are introduced briefly.Applied threeparameters,all models of perovskite structure (Pbnm) changing at high pressure are summed up.Some of the models suit all perovskites structures.As an example,CaTiO3 (Pbnm) structure changing at high pressure is analyzed by applying several models and qualitatively draws a conclusion that the structure symmetry is reduced with enhancing the pressure.

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