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The origin of varistor property of SrTiO3-based ceramics

The origin of varistor property of SrTiO3-based ceramics
The origin of varistor property of SrTiO3-based ceramics
The role of oxygen in the heat treatment process of SrTiO3 varistor ceramics has been investigated in this paper. The varistor voltage of SrTiO3 ceramics has been found independent of the sample thickness and it increases with the heat treatment temperature. It has been further revealed that the dielectric property is mainly governed by a highly resistive surface layer. The XPS results of Mn 2p and O 1s suggest that the surface layer is formed by oxygen diffusion and surface chemisorption at grain boundaries during the heat treatment in air. The chemisorption of oxygen in grain boundaries, which leads to the highly resistive surface layer, is the origin of the varistor property of SrTiO3 ceramics.
483-486
Li, J Y
9005acc4-cd82-429c-b00f-4218bef70968
Li, S T
ffe0dc55-9ec1-489f-a25e-43f962990931
Liu, F Y
87f72be2-e7e2-4e46-90ab-f5e3c9bec30e
Alim, M A
40ab0be3-ad7c-4a34-b187-e22211e0d2c0
Chen, G
9123f4c7-820c-452f-9ed6-25369ea3855e
Li, J Y
9005acc4-cd82-429c-b00f-4218bef70968
Li, S T
ffe0dc55-9ec1-489f-a25e-43f962990931
Liu, F Y
87f72be2-e7e2-4e46-90ab-f5e3c9bec30e
Alim, M A
40ab0be3-ad7c-4a34-b187-e22211e0d2c0
Chen, G
9123f4c7-820c-452f-9ed6-25369ea3855e

Li, J Y, Li, S T, Liu, F Y, Alim, M A and Chen, G (2003) The origin of varistor property of SrTiO3-based ceramics. Journal of Materials Science: Materials in Electronics, 14, 483-486.

Record type: Article

Abstract

The role of oxygen in the heat treatment process of SrTiO3 varistor ceramics has been investigated in this paper. The varistor voltage of SrTiO3 ceramics has been found independent of the sample thickness and it increases with the heat treatment temperature. It has been further revealed that the dielectric property is mainly governed by a highly resistive surface layer. The XPS results of Mn 2p and O 1s suggest that the surface layer is formed by oxygen diffusion and surface chemisorption at grain boundaries during the heat treatment in air. The chemisorption of oxygen in grain boundaries, which leads to the highly resistive surface layer, is the origin of the varistor property of SrTiO3 ceramics.

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More information

Published date: 2003
Organisations: Electronics & Computer Science

Identifiers

Local EPrints ID: 257532
URI: http://eprints.soton.ac.uk/id/eprint/257532
PURE UUID: b24acd54-30d8-4bc2-888b-0591f9703f64

Catalogue record

Date deposited: 04 Jun 2003
Last modified: 08 Jan 2022 05:43

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Contributors

Author: J Y Li
Author: S T Li
Author: F Y Liu
Author: M A Alim
Author: G Chen

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