Evaluation of rare earth oxides doping SnO2.(Co1/4,Mn3/4)O-based varistor system

Evaluation of rare earth oxides doping SnO2.(Co1/4,Mn3/4)O-based varistor system

The present paper aims to verify the inuence of rare earth oxide such as lanthanum (La2O3) and neodymium (Nd2O3) doping SnO2 + 0.25%CoO + 0.75%MnO2 + 0.05%Ta2O5 system. The analysis focus on microstructural inuence on electrical properties. Microstructural analysis were made by using Transmission El...

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Bibliographic Details
Main Authors: Alessandro Dibb, Mario Cilense, Paulo Roberto Bueno, Yves Maniette, José Arana Varela, Elson Longo
Format: Article
Language:English
Published: Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) 2006-09-01
Series:Materials Research
Subjects:
ceramic
varistor
tin dioxide
rare earth oxides
Online Access:http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392006000300015
Description
Summary:The present paper aims to verify the inuence of rare earth oxide such as lanthanum (La2O3) and neodymium (Nd2O3) doping SnO2 + 0.25%CoO + 0.75%MnO2 + 0.05%Ta2O5 system. The analysis focus on microstructural inuence on electrical properties. Microstructural analysis were made by using Transmission Electron Microscopy (TEM) at different regions of the samples. From such analysis it was found that La2O3 and Nd2O3 oxides cause heterogeneous segregation and precipitation at grain boundary concerning cobalt and manganese, decreasing the nonohmic electrical properties, as discussed, likely due to the increasing of grain boundary non-active potential barriers.
ISSN:1516-1439

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