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The Effect of Strong Reducing Atmosphere on the Electrical Property and Microstructure of SrTiO3 Varistor Ceramics

The Effect of Strong Reducing Atmosphere on the Electrical Property and Microstructure of SrTiO3 Varistor Ceramics
The Effect of Strong Reducing Atmosphere on the Electrical Property and Microstructure of SrTiO3 Varistor Ceramics
The microstructural effect on the electrical properties of SrTiO3 based varistor-capacitor materials sintered at various atmospheric conditions is investigated. Three sintering atmospheres were used: 30%H2+70%N2, 50%H2+50%N2 and 75%H2+25%N2 which is decomposed by liquid ammonia. It is found that with an increase of H2 percentage in sintering atmosphere, the grain size and electron concentration increase while varistor voltage U10mA and nonlinear coefficient a decrease. It is suggested that more oxygen vacancies can be formed in strong reducing atmospheres, and the grain growth process is mainly controlled by grain boundary diffusion, which leads to a lower sintering temperature. The results of PAT reveal that higher free electron concentration can be generated which lead to the change of electrical properties.
SrTiO3 varistor ceramics, effect of atomsphere, microstructure, grain boundary
7-900371-56-7
507-510
Li, J
e0ade5f8-f879-43ff-81bc-0661aadccee1
Li, S
913ba08e-bff5-48fc-9604-872010707dbb
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Li, J
e0ade5f8-f879-43ff-81bc-0661aadccee1
Li, S
913ba08e-bff5-48fc-9604-872010707dbb
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Li, J, Li, S and Chen, G (2003) The Effect of Strong Reducing Atmosphere on the Electrical Property and Microstructure of SrTiO3 Varistor Ceramics. The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, China. 27 - 30 Oct 2003. pp. 507-510 .

Record type: Conference or Workshop Item (Other)

Abstract

The microstructural effect on the electrical properties of SrTiO3 based varistor-capacitor materials sintered at various atmospheric conditions is investigated. Three sintering atmospheres were used: 30%H2+70%N2, 50%H2+50%N2 and 75%H2+25%N2 which is decomposed by liquid ammonia. It is found that with an increase of H2 percentage in sintering atmosphere, the grain size and electron concentration increase while varistor voltage U10mA and nonlinear coefficient a decrease. It is suggested that more oxygen vacancies can be formed in strong reducing atmospheres, and the grain growth process is mainly controlled by grain boundary diffusion, which leads to a lower sintering temperature. The results of PAT reveal that higher free electron concentration can be generated which lead to the change of electrical properties.

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More information

Published date: 2003
Additional Information: Event Dates: October 27-30, 2003
Venue - Dates: The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, China, 2003-10-27 - 2003-10-30
Keywords: SrTiO3 varistor ceramics, effect of atomsphere, microstructure, grain boundary
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 258525
URI: http://eprints.soton.ac.uk/id/eprint/258525
ISBN: 7-900371-56-7
PURE UUID: c126d73a-52be-40d4-ae5d-d8e5c2f96055

Catalogue record

Date deposited: 10 Nov 2003
Last modified: 29 Jan 2020 15:32

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Contributors

Author: J Li
Author: S Li
Author: G Chen

University divisions

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