中国物理B ›› 1997, Vol. 6 ›› Issue (4): 302-309.doi: 10.1088/1004-423X/6/4/009

• • 上一篇    

DIELECTRIC AND PYROELECTRIC CHARACTERISTICS AND FERROELECTRIC SOFT MODES IN PbTiO3 POLYCRYSTALS DOPED WITH Ca2+

邹秦1, 孟中岩2, 郭阿强3   

  1. (1)Department of Electronic Engineering, Xi'an Jiaotong University, Xi'an 710049, China; (2)Department of Materials Sciene, Shanghai University, Shanghai 201800, China; (3)Department of Technical Physics, Xidian Electronic University of Science and Technology, Xi'an 710071, China
  • 收稿日期:1996-01-03 出版日期:1997-04-20 发布日期:1997-04-20

DIELECTRIC AND PYROELECTRIC CHARACTERISTICS AND FERROELECTRIC SOFT MODES IN PbTiO3 POLYCRYSTALS DOPED WITH Ca2+

ZOU QIN (邹秦)a, GUO A-QIANG (郭阿强)b , MENG ZHONG-YAN (孟中岩)c   

  1. a Department of Electronic Engineering, Xi'an Jiaotong University, Xi'an 710049, China; b Department of Technical Physics, Xidian Electronic University of Science and Technology, Xi'an 710071, China; c Department of Materials Sciene, Shanghai University, Shanghai 201800, China
  • Received:1996-01-03 Online:1997-04-20 Published:1997-04-20

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摘要： The effects of Ca2+ ions on the structure and dielectric and pyroelectric characteristics of PbTiO3 polycrystals were investigated. With increasing content of Ca, a decrease in tetragonal axial ratio (c/a) was observed as a consequence of shrinkage of the lattice parameter c. The dielectric constant and pyroelectric coefficient increase and Curie temperature (TC) shifts toward lower temperature with increasing content of Ca. The theory of ferroelectric soft mode has been developed to illuminate the relationship between the structure and properties of the polycrystal.

Abstract: The effects of Ca2+ ions on the structure and dielectric and pyroelectric characteristics of PbTiO3 polycrystals were investigated. With increasing content of Ca, a decrease in tetragonal axial ratio (c/a) was observed as a consequence of shrinkage of the lattice parameter c. The dielectric constant and pyroelectric coefficient increase and Curie temperature (TC) shifts toward lower temperature with increasing content of Ca. The theory of ferroelectric soft mode has been developed to illuminate the relationship between the structure and properties of the polycrystal.

中图分类号:  (Pyroelectric and electrocaloric effects)

  • 77.70.+a
61.66.Fn (Inorganic compounds) 77.22.Ch (Permittivity (dielectric function))