Effects of MnO addition on the stable dielectric properties of BaTiO3- (Bi0.5Na0.5)TiO3-Ta2O5 ceramics. Issue 14 (1st October 2018)

• Record Type: Journal Article
• Authors: Wang, Sea-Fue; Chen, Yen-Sheng; Hsu, Yung-Fu; Liu, Yi-Xin
• Is Part Of: Ceramics international. Volume 44:Issue 14(2018)
• Page Start: 17038
• Page End: 17043
• Publication Date: 2018-10-01
• Subjects: Dielectric properties -- X9R -- Formulation -- Microstructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2018.06.147
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: The dielectric composition of 0.9BaTiO3 -0.1(Bi0.5 Na0.5 )TiO3 with 4 mol% Ta2 O5 sintered at 1230 °C revealed a dielectric constant (K) of 1179, tanδ values of 1.32% and 8.56%, and temperature coefficients of capacitance (TCCs) of 0.6% and − 14.05% at 25 °C and 200 °C, respectively, which meet the X9R specifications. In this study, various amounts of MnO additive were investigated for their ability to reduce the tanδ values of the compounds at 25 °C and 200 °C. Results indicated that the microstructure consists of fine equiaxed grains with a perovskite structure and second phases including plate-like Ba6 Ti17 O40, granular Ba3 Ta3.2 Ti5 O21, and large granular Ba4 Ti2 O27 grains, depending on the MnO content. The MnO additive dramatically reduces tanδ values in the measured temperature range, even though it does not significantly change the microstructure for up to 4.5% addition. The 0.9BaTiO3 -0.1(Bi0.5 Na0.5 )TiO3 with 4 mol% Ta2 O5 and 0.01% MnO showed a K of 1107, tanδ values of 1.16% and 0.23% and TCCs of − 4.32% and − 13.81% at 25 °C and 200 °C, respectively. The dielectric properties of the formulations prepared in this study were highly repeatable, which confirmed their immense potential for use in X9R capacitors.