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/2Bi2Nb2O9 (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%.
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