La添加SrTiO_3の粒成長に与えるTi/Sr比の影響

概要

論文の詳細を見る
The effect of Ti/Sr ratio on the grain growth of La-doped SrTiO_3 ceramics sintered at 1400-1490℃ for 2h in 5%H_2-95%N_2 with precisely controlled Ti/Sr ratio of 0.96-1.04 was investigated. The grain size was maximum at Ti/Sr ratio of 1.000 and remarkably decreased with excess amounts of Sr and Ti above 1470℃. However, the grain size was 2μm and almost constant below 1440℃ regardless of the composition. The bulk density was almost constant(97%)in the Ti excess region, but decreased remarkably by addition of excess Sr. The microstructure was divided into three types depending on the Ti/Sr ratio and sintering temperature;(1)Sr rich region, (2)Ti/Sr≩1 and above 1470℃, (3)Ti/Sr≩1 and below 1440℃. In the early stage, the nuclei of remarkably grown grains were formed and their amount and the grain growth rate were dependent on the Ti/Sr ratios.
社団法人日本セラミックス協会の論文
1996-03-01