Journal of Inorganic Materials

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Structures and Properties of Bismuth Layer-structured Piezoelectric Ceramics with High Tc

YAN Hai-Xue; LI Cheng-En; ZHOU Jia-Guang; ZHU Wei-Min   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences; Shanghai 200050; China
  • Received:1999-04-08 Revised:1999-05-21 Published:2000-04-20 Online:2000-04-20

Abstract: This paper reviewed the structures and properties of bismuth layer-structured piezoelectric
ceramics. The structures of bismuth layer-structured piezoelectric ceramics are built up by the regular intergrowth of (Bi2O2)2+
layers and perovskite (Am-1BmO3m+1)2- slabs where A is a combination of cations adequate for 12-coordinated interstices,
B is a combination of cations well suited to octahedral coordinated, and m is an integer usually lying to the range 1-5. By comparison with
barium titanate (BaTiO_3) or lead zirconate titanate (PZT) ceramics, the bismuth layer-structured piezoelectric ceramics are characterized
by: (1) lower dielectric constant; (2) higher Curie temperature; (3) stronger anisotropy in electromechanical coupling factors; (4) lower
ageing rate; (5) higher resistivity; …etc..

Previous studies showed that Curie temperature depends on atomic displacement of polarization cations, spontaneous polarization, bismuth
content in the cubooctahedral cavities, and the nature of the substituting cations such as inonic radius, electronegativities and electronic
configuration. An essentially weak point of bismuth layer-structured piezoelectric ceramics is low piezoelectric activity which can be
solved by chemical substitution or fabrication methods for orientating the grains in ceramics. It is necessary to study the relationships
between structures and properties of bismuth layer-structured piezoelectric ceramics in order to develop the materials.

Key words: bismuth layer-structured, properties, curie temperature

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