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Effect of Mn2+ Additive on the Sinterability and Dielectric Properties of Ba0.55Sr0.4Ca0.05TiO3-MgO Composite Ceramics

Ba0.55Sr0.4Ca0.05TiO3-MgO (BSCTM) with Mn2+ additive composite ceramics were prepared by the conventional solid state method with BaCO3, SrCO3, CaCO3, MgO and MnCO3 as raw materials and B2O3 and Li2CO3 as sintering agent. The influence of the MnCO3 additive on the sinterability and dielectric properties of BSCTM composite ceramics are investigated. The morphologies were analysized by scanning electron microscopy (SEM). The dielectric constant and dielectric loss of ceramics were measured by LCR meter at 1 kHz and 1 MHz. The temperature dependences of dielectric constant were measured by high-low temperature incubator tank and LCR meter at 1 MHz and a temperature range from-55 to 125 °C. The dielectric tunabilities were tested by C-T-V converter and LCR meter at 1 MHz and room temperature (25 °C). SEM results showed that BSCTM ceramics became more compact with the increase of Mn2+ content, because Mn2+ helped to form more oxygen vacancies for accelerating densification process. The addition of Mn2+ largely reduced the dielectric loss while had little effect on dielectric constant. The dielectric constant and dielectric loss of 0.5mol% Mn2+ doped BSCTM ceramics were 222 and 0.001, respectively. The dielectric tunability increased at first and then decreased with the increase of Mn2+ content. The tunability of 0.5mol% Mn2+ doped BSCTM ceramics were 4.04% under a DC electric field of 8.2 kV/cm.