Low temperature sintering of the binary complex perovskite oxides xBa(Zn1/3Ta2/3)O3 + (1 − x)Ba(Mg1/3Ta2/3)O3

The interest for the complex perovskites oxides is known since several years. Ba(Zn1/3Ta2/3)O3 (BZT) and Ba(Mg1/3Ta2/3)O3 (BMT) have been broadly studied due to their attractive dielectric properties suitable for applications such as multilayer ceramic capacitors or hyperfrequency resonators. They hence exhibit at 1 MHz very low dielectric losses combined with a high relative dielectric constant which is stable with the temperature. Unfortunately, these materials needs a too high temperature to reach a satisfying density. The BMT sintering temperature is indeed higher than 1500 °C, which is too high to envisage a co-sintering with copper (Tf = 1083 °C) or nickel (Tf = 1450 °C). To lower the sintering temperature, a glass phase addition is performed on the complex formulations xBa(Zn1/3Ta2/3)O3 + (1 − x)Ba(Mg1/3Ta2/3)O3 (with x = 0, 1/3, 1/2, 2/3 and 1). These mixtures are envisaged to explore their dielectric properties. The sintering temperature lowering reached is higher than 400 °C when 10 molar% of borate oxide is added to the mixtures and their dielectric properties are very attractive (ɛ = 25 and τɛ = −59 ppm/°C for x = 1/3) for the fabrication of base metal electrodes multi layer ceramic capacitors (BME-MLCC).