Study on dielectric property of BST based ceramics doped with MgTiO₃

ABSTRACT

(Ba_0.65Sr_0.35)TiO₃ (BST) ceramics doped with MgTiO₃ were prepared by solid state method. Influence of MgTiO₃ doped amount on dielectric property and microstructure of BST ceramics were investigated. The results showed that MgTiO₃ doping could fine crystal grain size and made crystal grain size uniform and pore decrease and density increase. MgTiO₃ doping could decrease dielectric loss (tanδ) and increase dielectric constant(ϵ_r) of BST ceramics and increase the alternating current (AC) withstand voltage strength (E_b) and improve the capacitance temperature property. When MgTiO₃ doping amount was 0.8wt.%, the BST ceramics had good comprehensive property, ϵ_r of 4350, tanδ of 0.0055, E_b of 5.7×10³ V/mm (AC), the capacitance temperature property was suited for Y5U.

KEYWORDS:

• Capacitor ceramics
• ferroelectrics
• MgTiO₃ doping
• barium and strontium titanate
• dielectric property

Funding

This program was supported by the State Key Laboratory of New Ceramic and Fine Processing,Tsinghua University (No. KF201411). The work was supported by Program of Science and Technology Support of Jiangsu Province (No. BE2008029). The work was supported by Project of Combination of Producing, Learning and Studying of Guangdong Province and Education Department (No. 2011B090400027) and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions.