MO_<0.5>Bi_<2.5>Ta_2O_9(M=Na, K) セラミックスの合成及び強誘電特性

概要

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Bismuth layer-structured ferroelectrics (BLSFs), M_<0.5>Bi_<2.5>Ta_2O_9 (M=Na, K) were synthesized using a solid-state reaction. Na_<0.5>Bi_<2.5>Ta_2O_9 (NBT) single phase polycrystals were obtained by heating raw material powders at 1100℃. On the other hand, K_<0.5>Bi_<2.5>Ta_2O_9 (KBT) powder contained KTaO_3 as a main impurity phase. Dense ceramics of NBT were prepared by considering Bi_2O_3 vaporization and using a binder. Result of dielectric and ferroelectric characterizations of the NBT ceramic were as follows: Curie temperature, T_C= 780℃, dielectric constant, ε_S=158, dielectric loss factor, tan δ=0.011 as measured at room temperature and 1 MHz and the remanent polarization, P_r=15-18μC・cm^-2 The P_r value is the largest among reported BLSFs that are composed of two perovskite layers.
社団法人日本セラミックス協会の論文
2002-04-01