Investigations of the electrical property, diffuse reflectance and ESR spectra of the La-(Fe,Mn)-codoped PTCR BaTiO3 annealed in reducing atmosphere

被引：21

作者：

Er, G ^{[1
]}

Ishida, S ^{[1
]}

Takeuchi, N ^{[1
]}

机构：

[1] Kyoto Inst Technol, Dept Chem & Mat Technol, Sakyo Ku, Kyoto 6060962, Japan

来源：

JOURNAL OF MATERIALS SCIENCE | 1999年 / 34卷 / 17期

关键词：

D O I：

10.1023/A:1004659004372

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Electrical properties of La-(Fe,Mn)-codoped positive temperature coefficient of resistivity (PTCR) BaTiO3 ceramics were studied by combining their diffuse reflectance measurements and electron spin resonance (ESR) spectroscopy. La-(Fe,Mn)-codoped samples showed high durability to reducing atmosphere. It is assumed that Fe and Mn ions segregated in the grain boundary contribute to the density of surface acceptor states, meanwhile localizing electrons in a form of Ti3+ and stabilizing the chemisorbed oxygens through La3+-Mn-3+,Mn-4+ or La3+-Fe3+ pairs. In addition, ESR signals of Fe3+ in annealed samples was intensified above Curie temperature (T-c), indicating that Fe ions still maintained its high valence states (Fe3+) in the grain boundary even after annealing in reducing atmosphere. (C) 1999 Kluwer Academic Publishers.

引用

页码：4265 / 4270

页数：6

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