Synthesis and Ferroelectric Properties of M0.5Bi2.5Ta2O9 (M=Na, K) Ceramics

Bismuth layer-structured ferroelectrics (BLSFs), M0.5Bi2.5Ta2O9 (M=Na, K) were synthesized using a solidstate reaction. Na0.5Bi2.5Ta2O9 (NBT) single phase polycrystals were obtained by heating raw material powders at 1100°C. On the other hand, K0.5Bi2.5Ta2O9 (KBT) powder contained KTaO3 as a main im...

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Bibliographic Details
Published inJournal of the Ceramic Society of Japan Vol. 110; no. 1280; p. 255
Main Authors KOMAGATA, Kazuya, TAKEDA, Hiroaki, SHIOSAKI, Tadashi
Format Journal Article
LanguageEnglish
Published Tokyo Japan Science and Technology Agency 01.01.2002
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Summary:Bismuth layer-structured ferroelectrics (BLSFs), M0.5Bi2.5Ta2O9 (M=Na, K) were synthesized using a solidstate reaction. Na0.5Bi2.5Ta2O9 (NBT) single phase polycrystals were obtained by heating raw material powders at 1100°C. On the other hand, K0.5Bi2.5Ta2O9 (KBT) powder contained KTaO3 as a main impurity phase. Dense ceramics of NBT were prepared by considering Bi2O3 vaporization and using a binder. Result of dielectric and ferroelectric characterizations of the NBT ceramic were as follows: Curie temperature, TC=780°C, dielectric constant, [straight epsilon]s=158, dielectric loss factor, tan δ=0.011 as measured at room temperature and 1MHz and the remanent polarization, Pr=15-18μC·cm-2. The Pr value is the largest among reported BLSFs that are composed of two perovskite layers.
ISSN:1882-0743
1348-6535