Journal of Inorganic Materials

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Spontaneous Polarization of BaTiO3 at Low Temperatures

CAI Yu-Ping, NING Ru-Yun, HAN Dai-Zhao   

  1. Department of Basic Courses, Ordnance Engineering College, Shijiazhuang 050003, China
  • Received:2005-11-21 Revised:2006-04-20 Online:2007-01-20 Published:2007-01-20
  • Contact: CAI Yu-Ping

Abstract: The pressure-temperature phase diagram of BaTiO3 was investigated by using a modification of the standard Landau potential to take account of quantum saturation of the order parameter. At low temperatures, each phase boundary bends sharply down, and this non-linear behavior is associated with quantum mechanical effects. Saturation temperature θs characterizes the extent of quantum mechanical, and is related to the extent to which changes in the hard phonon modes influence the transition mechanism.

Key words: order parameter, Landau potential, spontaneous polarization, BaTiO3

CLC Number: 

  • O414