Microstructure Control of Porous Barium Titanate Ceramics and Their Sensor Properties

摘要

Porous barium titanate (BaTiO_3, 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 d_(33) constant of BT depends largely on the pore structures, the microstructure control of porous BT ceramics is important to improve the figure-of-merit (g_(33)/p). In this study, the maximal piezoelectric g_(33) constant value of 14.8×10~(-3) V·m·N~(-1) and the maximal g_(33)/p value of 3.14×10~3 V·m~4·N~(-1)·g~(-1) were recorded at a porosity of approximately 23%.