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The Dielectric Breakdown Properties of Porous PZT95/5 Ferroelectric Ceramics

Porous lead zirconate titanate (PZT95/5) ceramics were prepared by adding pore formers. Effects of pore structure including porosity, pore size and pore shape on the dielectric breakdown properties of porous PZT95/5 ceramics and their mechanism were investigated. The research showed that the dielectric breakdown voltage of porous PZT95/5 ceramics decreases with increasing porosity and pore size. The dielectric breakdown voltage of porous PZT95/5 ceramics with spherical pores is higher than that with irregular pores. The series pore model, pore discharge model and the regional discharge of oval pore theory were used to explain how pore structure affects dielectric breakdown properties of porous PZT95/5 ceramics.