Sr/Ba Ratio Dependence of Dielectric Characteristics in Strontium Barium NiobateCeramics

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J. Korean Ceram. Soc. > Volume 38(12); 2001 > Article

Journal of the Korean Ceramic Society 2001;38(12): 1167.

Sr/Ba 비에 따른 Strontium Barium Niobate 세라믹스의 유전특성

김명섭, 이준형, 김정주, 이희영¹, 조상희

서울산업대학교 재료공학과
¹영남대학교 재료금속공학과

Sr/Ba Ratio Dependence of Dielectric Characteristics in Strontium Barium NiobateCeramics

ABSTRACT

The tetragonal tungsten bronze type of Sr$_{x}Ba_{1-x}Nb_{2}O_{6}$(SBN) (0.3$le$x$ge$0.7) ceramics was synthesized by the solid state reaction method, and the dielectric properties of SBN ceramics as a function of Sr/Ba ratio were examined. With increasing Sr/Ba ratio in SBN ceramics, the Curie temperature decreased and the maximum dielectric constant at the Curie temperature increased. The relaxor behavior of the SBN ceramics as a function of Sr/Ba ratio was quantitatively evaluated. More relaxor behavior of dielectric characteristics was observed as the ratio of Sr/Ba increased. The experimental results are explained with a viewpoint of crystallography of tungsten bronze structured SBN ceramics.

Key words: Tungsten bronze structure, SBN, Relaxor, DPT