Piezoelectric properties of bismuth layer-structured ferroelectric na0.5bi4.5ti4o15 ceramic

Abstract

Piezoelectric properties of the grain-oriented Na0.5Bi4.5Ti4O15 (NBT) ceramic, belong to the bismuth layer-structured ferroelectric (BLSF) ceramics are studied from applicational viewpoints on grain orientation prepared by the hot-forging (H.F.) method. The MnC03 (0.1 wt%) doped NBT (NBT+Mn(0.1)) ceramic can stand the high temperature poling process, because of the high resistivity. The grain orientation (H.F.) makes the piezoelectric properties of NBT + Mn(0.1) ceramic much more pronounced than those of the non-oriented (O.F.) ceramic. Coupling factors k33 and k15, along with piezoelectric constants d33, d55, g33 and g15, of the H.F. NBT+Mn(0.1) ceramic are enhanced, and their anisotropics in k33/k31 and kl5/k24 are emphasized. A bulk wave delay line oscillator using the ceramic substrate is demonstrated. © 1985 The Japan Society of Applied Physics.