Effects of Doped Cu, Mn on Electrical Properties of SrTiO₃-Based Varistor Ceramics

Abstract:

CuO and MnCO₃ doped SrTiO₃-based multifunction ceramics were prepared respectively with solid state reaction method under vacuum condition. The electrical properties’ change with the oxidation temperature and microstructure were investigated. The results show that acceptor dopants behaves differently with the same sintering conditions. CuO-doped ceramic possess relative higher dielectric loss, dielectric constant and relative lower nonlinear coefficient, varistor voltage in contrast with MnCO₃ doped ceramic with the same contents under the same sintering conditions. The grain size of CuO-doped sample is significantly larger than the sample doped with MnCO₃. The grain distributions of CuO-doped sample is more homogeneous. The electrical properties of the ceramics are different due to the different behaviors of CuO and MnCO₃ accepter dopants during the sintering process.

• Periodical: Advanced Materials Research (Volumes 399-401)
• Pages: 783-787
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.399-401.783
• Online since: November 2011
• Authors: Ning Zhang Wang, Zhang Wen
• Keywords: Acceptor Dopants, Low-Temperature, STO Varistors, Vacuum

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