The Effect of Strong Reducing Atmosphere on the Electrical Property and Microstructure of SrTiO3 Varistor Ceramics
Li, J, Li, S and Chen, G (2003) The Effect of Strong Reducing Atmosphere on the Electrical Property and Microstructure of SrTiO3 Varistor Ceramics. At The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, Chongqing, China, 27 - 30 Oct 2003. Sichun Publishing House of Science & Technology, 507-510.
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Description/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.
| Item Type: | Conference or Workshop Item (Speech) |
|---|---|
| Additional Information: | Event Dates: October 27-30, 2003 |
| ISBNs: | 7900371567 |
| Keywords: | SrTiO3 varistor ceramics, effect of atomsphere, microstructure, grain boundary |
| Divisions: | Faculty of Physical and Applied Science > Electronics and Computer Science Faculty of Physical and Applied Science > Electronics and Computer Science > EEE |
| Item ID: | 258525 |
| Date Deposited: | 10 Nov 2003 |
| Last Modified: | 02 Mar 2012 12:58 |
| Contributors: | Li, J (Author) Li, S (Author) Chen, G (Author) |
| Date: | 2003 |
| Additional Information: | Event Dates: October 27-30, 2003 |
| Status: | Published |
| Publisher: | Sichun Publishing House of Science & Technology |
| Further Information: | Google Scholar |
| URI: | http://eprints.soton.ac.uk/id/eprint/258525 |
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