Paper Title:
Grain Size Effects of SnO2 Varistor Induced by Doping Pr
  Abstract

The effects of Pr on the microstructure and nonlinear electrical properties of the (Co,Ta)-doped SnO2 varistors were investigated. It was found by characterizing the samples sintered at 1350 oC that the breakdown voltage increases significantly from 500v/mm to 1200v/mm, and the relative permittivity decreased rapidly from 2525 to 1199 with increasing Pr6O11 concentration from 0 to 1.20 mol%. The analysis of samples’ microscopic structure showed that the grain size of SnO2 rapidly decreases from 5.1 to 3.7 µm with increasing Pr6O11 concentration from 0 to 1.20mol% .The significant decrease of SnO2 grain size is the main reason for raising breakdown voltage and reducing permittivity.

  Info
Periodical
Key Engineering Materials (Volumes 280-283)
Edited by
Wei Pan, Jianghong Gong, Chang-Chun Ge and Jing-Feng Li
Pages
275-278
DOI
10.4028/www.scientific.net/KEM.280-283.275
Citation
C. J. Zhang, J. F. Wang, W. B. Su, G. Z. Zang, H. C. Chen, "Grain Size Effects of SnO2 Varistor Induced by Doping Pr", Key Engineering Materials, Vols. 280-283, pp. 275-278, 2005
Online since
February 2007
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: Yoshiaki Kinemuchi, Hisashi Kaga, Satoshi Tanaka, Keizo Uematsu, Hiromi Nakano, Koji Watari
Abstract:Thermoelectric properties of zinc oxide ceramics are largely influenced by the mobility variation because of the formation of double...
581
Authors: Jin Liang He, Jun Hu, Feng Chao Luo
Abstract:The presence of twins in ZnO varistors raises interesting questions concerning the potential role of those electrically distinctive twin...
490
Authors: Adriana Scoton Antonio Chinelatto, Milena Kowalczuk Manosso, Elíria Maria Jesus Agnollon Pallone, Ana Maria Souza, Adilson Luiz Chinelatto
Abstract:Sintering in two-steps has been applied with success for densification of nanometric and submicrometer ceramic powders without grain growth....
221
Authors: Zainuddin Zalita, S.N. Anuar, Roslinda Shamsudin, M.N. Idris
Chapter 1: Advanced Ceramics
Abstract:Barium titanate with 10% barium ferrite substitution (BaTiO3-BaFe12O19) has been synthesized by the solid...
14
Authors: Zhen Jiang Shen, Li Na Bing
Chapter 5: Materials Science and Processing Technologies, Mechanics of Materials
Abstract:Colossal permittivity (CP) in BaTiO3 (BT)-based polycrystalline ceramics with normal grain sizes has been successfully obtained in...
360