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

Da Hao Wang; Hui Ming Ji; Qian Qian Jia

doi:10.4028/www.scientific.net/KEM.602-603.710

Paper Titles

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Temperature-Dependent Structure of a High-k (Ba,La)(Ti,Ce)O₃ Ceramic
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 602-603Effect of Mn2+ Additive on the Sinterability and...

Effect of Mn²⁺ Additive on the Sinterability and Dielectric Properties of Ba_0.55Sr_0.4Ca_0.05TiO₃-MgO Composite Ceramics

Abstract:

Ba_0.55Sr_0.4Ca_0.05TiO₃-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 B₂O₃and Li₂CO₃as 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.