Behaviours of Nb5+ and Sr2+ in The Varistors Based on SrO-Nb2O5-TiO2 Ceramics

Abstract

Abstract: By microstructure analysis, I-V characteristics and complex impedance spectra measurement, the
microstructure and related electric properties for the varistors based on SrO-Nb₂O₅-TiO₂ semiconducting ceramics with different doped
amounts of Nb⁵⁺ and Sr²⁺ were investigated. The distribution and effects of Nb⁵⁺ and Sr²⁺ on electric properties for the
materials were discussed. The results show that Nb⁵⁺ dissolves into TiO₂ grains substitutes Ti⁴⁺ to enhance ceramic semiconducting
behavior, and proper addition of Nb-doped amount can avail grain growing. The Sr²⁺ mainly distributes in grain boundary areas,
which behaves as an interface acceptor state and so influences on the electric properties of varistor markedly. The experimental results on
post heat-treatment in air show that the varistor voltage is increased observably with heat-treatment temperature above 800℃, but the
nonlinear coefficient is ameliorated only at an appropriate temperature range.

Key words: （Sr, Nb）-TiO₂ ceramic, semiconductor, varistor

CLC Number:

TN304
379

ZHOU Fang-Qiao,LI Li,ZHUANG Yan,FU Gang,CHEN Zhi-Xiong. Behaviours of Nb⁵⁺ and Sr²⁺in The Varistors Based on SrO-Nb₂O₅-TiO₂ Ceramics[J]. Journal of Inorganic Materials.

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Behaviours of Nb⁵⁺ and Sr²⁺in The Varistors Based on SrO-Nb₂O₅-TiO₂ Ceramics

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