Abnormal Grain Growth Behavior of <TEX>$BaTiO_3$</TEX> Ceramics with Addition of Seed Grains

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J. Korean Ceram. Soc. > Volume 32(5); 1995 > Article

Journal of the Korean Ceramic Society 1995;32(5): 587.

Seed 입자 첨가에 따른 $BaTiO_3$ 요업체의 비정상 입성장거동

이태헌, 김정주, 김남경, 조상희

경북대학교 무기재료공학과

Abnormal Grain Growth Behavior of $BaTiO_3$ Ceramics with Addition of Seed Grains

ABSTRACT

Abnomal grain growth behavior of BaTiO3 ceramics was investigated with addition of seed grains. It was foudn that the nucleation rate of abnormal grain was constant and growth of abnormal grain was linearly increased with sitnering time, regardless of amount of seed grains. These facts were also confirmed by fitting of the volume fraction of abnormal grain vs. sintering time using Avrami type equation (n=4). It was suggested that seed grains did not change the nucleation rate or growth mechanism of abnormal grain but increase the number of abnormal grains at initial stage of sintering and then it led to fine microstructure of BaTiO3 ceramics.

Key words: $BaTiO_3$ ceramics, Seed grain, Abnormal grain growth, Avrami equation