MICROSTRUCTURE AND DIELECTRIC PROPERTIES OF BARIUM ZIRCONATE TITANATE CERAMICS BY TWO METHODS

ABSTRACT

Barium zirconate titanate (short for BZT) ceramics were prepared by sol-gel method and solid state reaction method, respectively. The BZT ceramics prepared by two methods are both single cubic perovskite phase. The average grain size of the ceramics by sol-gel method is much smaller than that of the ceramics by solid state reaction method, and the shape of grain tends to be spherical. The BZT ceramics with smaller grain size prepared by sol-gel method have the lower Curie temperature and dielectric constant, the higher dielectric loss and the stronger diffuse phase transition than that of the ceramics with larger grain size prepared by solid state reaction method. The coercive electric field of the BZT ceramics prepared by sol-gel method is much more than that of the BZT ceramics prepared by solid state reaction method, while the remanent polarization of the BZT ceramics prepared by sol-gel method is less than that of the BZT ceramics prepared by solid state reaction method.

Keywords:

• Barium zirconate titanate
• ceramics
• sol-gel
• dielectric properties
• diffuse phase transition