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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 39, Number 10
JKCSEZ 39(10)
August 20, 1995

Title	Electrical Properties of (Ba,Sr)1-xYxTiO3 with Variation of Yttrium Content 이트륨 혼입량 변화에 따른 (Ba,Sr)1-xYxTiO3 의 전기적 특성
Author	Taeyong Noh, Hyun Je Sung, Seungwon Kim, Chul Lee* 노태용, 성현제, 김승원, 이 철*
Keywords
Abstract	정온도저항계수(PTCR) 특성을 지닌 (Ba,Sr)1-xYxTiO3(x=0.001~0.009, BSYT)를 옥살산공침법으로 합성하여 이트륨 혼입량 변화에 따른 전기적 특성을 관찰하였다. 온도변화에 따른 저항을 측정한 결과 이트륨의 농도가 0.3mol%로 증가할 때까지는 큰 PTCR 효과를 나타낸 반면 농도가 0.5mol% 이상에서는 적은 PTCR 효과를 나타내었다. 상전이 온도(Tc)이상에서 온도와 1/εm(T)의 관계를 나타낸 도시에 의하면 유전상수의 변화가 Curie-Wiese 법칙에 잘 따름을 알 수 있었다. 측정한 비저항과 유전상수로부터 계산한 전위장벽의 높이를 온도에 따라 도시한 결과 PTCR 효과와 마찬가지로 이트륨의 혼입량이 0.3mol%로 증가할 때까지는 높은 전위장벽이 유지되나 0.5mol% 이상에서는 비교적 낮은 전위장벽을 나타내었다. The electrical properties for (Ba,Sr)1-xYxTiO3(x=0.001∼0.009, BSYT) with a positive temperature coefficient of resistivity(PTCR) effect were investigated. The BSYT powder was prepared by oxalate coprecipitation method. It was found that the large PTCR effect was appeared up to 0.3 mol% and decreased above 0.5 mol% of the yttrium concentration. The plot of temperature vs. 1/εm(T) above Curie temperature(Tc) was agreed with Curie-Weiss law. The potential barrier calculated from measured resistivity and dielectric constant of specimens was high up to 0.3 mol% and reduced above 0.5 mol% of yttrium concentration as the curve of PTCR effect.
Page	806 - 811
Full Text	PDF

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