Compositions and electrical properties of complex bismuth layer-structured ferroelectric ceramics

Abstract

Complex compounds of bismuth Layer-structured ferroelectrics were studied on dielectric and piezoelectric properties. The Curie temperature Tc of solid solution systems based on PbBi2Nb2O9 linearly increases as the tolerance factor t for perovskite-like units of the layer structure rapidly decreases according to the increase of the substitution ion for Pb. A substitution of (NaBi)1/2 for Pb in the solid solution Pb1-x(NaBi)x/2Bi2Nb2 (PNBN-100x) system gives the elevated Tc and the easy poling process. Na0.5Bi2.5Nb2O9 is a very high Curie temperature of 785 °C. The coupling factor k33 of the hot-forged PNBN-50 is about 20%. © 1985 IOP Publishing Ltd.