You are in the accessibility menu

Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/25387
Title: 
Dependence of the nonlinear electrical behavior of SnO2-based varistors on Cr2O3 addition
Author(s): 
Institution: 
  • Universidade Estadual Paulista (UNESP)
  • Universidade Federal de São Carlos (UFSCar)
ISSN: 
0272-8842
Abstract: 
Tin dioxide varistors doped with Coo, ZnO, Ta2O5 and Cr2O3 were prepared by the mixed oxide method. Temperature dependent impedance spectroscopy revealed two different activation energies, one at low frequencies and the other at high frequencies. These activation energies were associated with the adsorption and reaction of O-2 species at the grain boundary interface. We show that Cr2O3 improves the varistor properties, generating sites for the adsorption of O' and O at the grain boundary region. The O' and O defects are truly responsible for the barrier formation at the grain boundary interface. (c) 2005 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
Issue Date: 
1-Jan-2007
Citation: 
Ceramics International. Oxford: Elsevier B.V., v. 33, n. 2, p. 187-192, 2007.
Time Duration: 
187-192
Publisher: 
Elsevier B.V.
Keywords: 
  • varistors
  • tin dioxide
  • impedance spectroscopy
Source: 
http://dx.doi.org/10.1016/j.ceramint.2005.07.025
URI: 
Access Rights: 
Acesso restrito
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/25387
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

There are no files associated with this item.
 

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.