Logo do repositório
 

The effect of Sb and Nb on the electrical conductivity of tin dioxide based ceramics

Carregando...
Imagem de Miniatura

Orientador

Coorientador

Pós-graduação

Curso de graduação

Título da Revista

ISSN da Revista

Título de Volume

Editor

Springer

Tipo

Artigo

Direito de acesso

Acesso restrito

Resumo

The electrical conductivity of Mn doped SnO2 systems prepared by an organic route (Pechini's method) has been investigated as a function of antimony and niobium concentration. The conductivity increases with the increase of both concentration ions, however, in a different manner. While the conductivity of niobium doped ceramics increases with the power of 1.6 for the entire range of concentrations studied (0.01-0.7 mol%), the conductivity of antimony doped ceramics increases with the power of 1.9 in the range 0.01-0.05 mol% of Sb; 3.7 in the range 0.05-0.30 mol% and 1.8 in the range 0.30-0.70 mol%. This behavior is attributed to the existence of two stable oxidation states for antimony: Sb3+ and Sb5+, while for niobium there is only one: Nb5+. The power of 3.7 for Sb would be related to the segregation of this ion on the grain boundary accompanied by an additional contribution coming from the substitution of Sn2+ by Sb3+ on the grain surface.

Descrição

Palavras-chave

Idioma

Inglês

Citação

Journal of Materials Science. New York: Springer, v. 41, n. 19, p. 6256-6259, 2006.

Itens relacionados

Financiadores

Unidades

Unidade
Instituto de Química
IQAR
Campus: Araraquara


Departamentos

Cursos de graduação

Programas de pós-graduação