Effect of Mn, Si on Varistor-Dielectric Characteristics of Nb-doped SrTiO₃ Ceramics

Abstract:

The varistor-dielectric characteristics of SrTiO3 ceramics with various amounts of MnCO3 and SiO2 additives was studied. The experimental results show that , with the increase of added amounts of MnCO3, the resistivity (ρ), nonlinear coefficient (α) and varistor voltage (V10mA) increase firstly and then decrease while the dielectric constant (ε) and dielectric loss (tgδ) decrease firstly and then increase. The best added amount of SiO2 is 0.4wt% because the electrical properties of SrTiO3 ceramics drop when x(SiO2)>0.4wt%.The SrTiO3 based ceramic, with the doping of 0.5mol%Nb2O5+0.5mol%MnCO3+0.4wt%SiO2, the better microstructure and electrical properties can be obtained.

• Periodical: Applied Mechanics and Materials (Volumes 239-240)
• Pages: 1604-1608
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.239-240.1604
• Online since: December 2012
• Authors: Ning Zhang Wang, Jian Ye Li, Ji Ning, Jing Liu
• Keywords: Additive, Dielectric-Varistor Characteristics, SrTiO₃ Ceramics

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