Dielectric properties and microstructures of non-reducible high-temperature stable dielectrics based on 0.9474BaTiO3-0.0526Ba2LiTa5O15

In this study, non-reducible high-temperature stable dielectrics based on 0.95BaTiO3-0.05Ba2LiTa5O15 compound with various dopants including Li2TiO3, MnCO3, CaCO3 and SiO2 were prepared through solid state reaction. The best composition obtained was 0.95BaTiO3-0.05Ba2LiTa5O15 with the addition of 5 mol% Li2TiO3, 1.5 mol% MnCO3, 2.0 mol% CaCO3 and 1.0 mol% SiO2. After being sintered at 1070 °C for 2 h in 3% H2-97%N2-3%H2 and heat-treated at 950 °C for 6 h in an atmosphere containing 100 ppm O2, the dielectric properties including temperature coefficient of capacitance (TCC): −3.6% at −55 °C and −9.2% at 200 °C, tanδ: 1.4% (−55 °C) and 11.2% (200 °C), electrical resistance: 1.2 × 1011 Ω-cm at 25 °C and 7.5 × 109 Ω-cm at 200 °C, and dielectric constant: 800 at 25 °C, were obtained, which meet the X9R requirements of EIA specifications.