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Oxygen adsorption and VDR effect in (Sr, Ca)TiO3−x based ceramics

Published online by Cambridge University Press:  31 January 2011

Yoshitaka Nakano  and
Noboru Ichinose
Yoshitaka Nakano
Affiliation:
Department of Materials Science and Engineering, School of Science and Engineering, Waseda University, 4-1, Ohkubo 3-chome, Shinjuku-ku, Tokyo 169, Japan
Noboru Ichinose
Affiliation:
Department of Materials Science and Engineering, School of Science and Engineering, Waseda University, 4-1, Ohkubo 3-chome, Shinjuku-ku, Tokyo 169, Japan
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Abstract

The relation between the oxygen adsorption and the voltage dependence of the resistor (VDR effect) in (Sr, Ca)TiO3−x based ceramics has been investigated. The nonlinearity of the voltage-current characteristics increased with increasing the barrier height, which is thought to be generated by the oxygen chemisorption. Acceptor type trap levels were detected by means of a zero biased DLTS technique at high temperatures. These interfacial energy levels changed with reoxidizing temperatures, and the change can be explained by the degradation of the chernisorbed oxygen. The high temperature type of the chemisorbed oxygen as O2− and O is relatively stable due to the strong pinning effect of trapped electrons, with reoxidizing anneals of grain surfaces above the oxidation temperature, and it contributes greatly to the VDR effect. It is concluded that energy barriers are caused by the interface states generated by the chemisorbed oxygen on grain surfaces and that they determine the VDR effect.

Type
Articles
Information
Journal of Materials Research , Volume 5 , Issue 12 , December 1990 , pp. 2910 - 2922
Copyright
Copyright © Materials Research Society 1990

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