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

被引:15
作者
Leite, D. R. [1 ]
Mazali, I. O. [1 ]
Aguiar, E. C. [1 ]
Las, W. C. [1 ]
Cilense, M. [1 ]
机构
[1] UNESP, Inst Quim, Dept Quim Fis, BR-14801970 Araraquara, SP, Brazil
关键词
D O I
10.1007/s10853-006-0499-4
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
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.
引用
收藏
页码:6256 / 6259
页数:4
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