The Effect of Ti/Sr Ratio on Abnormal Grain Growth of Nb-doped <TEX>$SrTiO_3$</TEX>

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J. Korean Ceram. Soc. > Volume 34(8); 1997 > Article

Journal of the Korean Ceramic Society 1997;34(8): 791.

$Nb_2O_5$를 첨가한 $SrTiO_3$의 비정상 입성장에 미치는 Ti/Sr 비의 영향

배철휘, 전형탁¹, 박재관, 김윤호

한국과학기술연구원 세라믹스 연구부
¹한양대학교 금속공학과

The Effect of Ti/Sr Ratio on Abnormal Grain Growth of Nb-doped $SrTiO_3$

ABSTRACT

The influence of Ti/Sr ratio on abnormal grain growth of Nb-doped SrTiO3 was investigated. For specimens which were isothermally sintered at temperatures above 144$0^{circ}C$, the nucleation and growth rates of abnormal grain growth were decreased with increasing Ti/Sr ratio. But the onset time of abnormal grain growth was increased with increasing Ti/Sr ratio. The cross-section of abnormally grown grains was mostly hexagonal. When the specimens were quenched in air after they reached their setting temperatures at a heating rate of 3$^{circ}C$/min, the onset temperature of abnormal grain growth was increased with increasing Ti/Sr ratio and the final grain size was independent of Ti/Sr ratio. The cross-section of abnormally grown grains was mostly rectangular.

Key words: $SrTiO_3$, Ti/Sr ratio, Abnormal grain growth