Medium temperature sintered BaTiO3-based ceramics for X8R capacitors

Abstract

The development of X8R BaTiO₃-based dielectric materials is of great significance for the high-temperature application of MLCCs. Herein, a series of BaTiO₃-based dielectric ceramics were prepared by the conventional solid-state method, and the effects of Bi₄Ti₃O₁₂ and Mn₃O₄ on the properties of BaTiO₃-based dielectric ceramics were studied. The SEM images show that the addition of Bi₄Ti₃O₁₂ with a low melting point can densify the ceramics at a lower sintering temperature (1,150 °C). TEM images and EDS results indicate that the samples have a “core-shell” structure, which can be optimized by Bi₄Ti₃O₁₂, resulting in phase transition dispersion and thus improving the temperature stability of the material. The addition of Mn can reduce the dielectric loss of ceramics at high temperatures. As a result, the optimal composition exhibits a high permittivity of 2,090, a low dielectric loss of 1.1%, and high temperature stability satisfying the X8R specification.