POTASSIUM GRAIN BOUNDARY SEGREGATION AND SITE OCCUPANCY IN SrTiO3 CERAMICS.

被引：0

作者：

Fujimoto, Masayuki ^{[1
]}

机构：

[1] Taiyo Yuden Co, Haruna, Jpn, Taiyo Yuden Co, Haruna, Jpn

来源：

Japanese Journal of Applied Physics, Part 2: Letters | 1987年 / 26卷 / 12期

关键词：

POTASSIUM AND ALLOYS - STRONTIUM COMPOUNDS - Grain Boundaries;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The grain boundary segregation profile of potassium in SrTiO//3 ceramics was revealed using HR-TEM (high-resolution transmission electron microscopy) and STEM (scanning transmission electron microscopy). HR-TEM showed precipitation-free grain boundaries in the specimen. STEM chemical analysis data, and K/Ti, K/Sr and Sr/Ti X-ray intensity ratios indicated a potassium segregation layer of less than 20 nm wide at the grain boundaries and Sr-site occupancy by potassium. These properties were considered responsible for the nonohmic current-voltage characteristic, i. e. , varistor behavior, of the specimen.

引用

页码：2065 / 2068