Preparation of barium titanate porous ceramics and their sensor properties

Abstract

Porous barium titanate (BaTiO3, BT) ceramics were prepared by a conventional sintering method using two kinds of BT particles. The relationship between pore structure (porosity and pore size) of BT ceramics and their sensor properties was investigated. Since a piezoelectric constant d33 of BT depends largely on the pore structures, the microstructure control of porous BT ceramics is important to improve the figure-of-merit of piezoelectric stress sensor application (g33/σ). In this study, the maximal piezoelectric g33 constant value of 14.8 × 10-3 V Em EN11 and the maximal g33/σ value of 3.14 × 10 3 V.m4.N-1.g-1 were obtained at a porosity of approximately 23%. © 2013 The Ceramic Society of Japan.