Effect of MnO2 on the electrical and dielectric properties of Y-doped Ba0.95Ca0.05Ti0.85Zr0.15O3 ceramics in reducing atmosphere

Abstract MnO 2 and Y 2 O 3 co-doped Ba 0.95 Ca 0.05 Ti 0.85 Zr 0.15 O 3 dielectric ceramics with excellent performance were fabricated using a conventional solid-state reaction method. The doping effects of various amounts of MnO 2 on the electrical and dielectric properties were studied. The results revealed that the electrical and dielectric properties greatly depended on the concentration of MnO 2 . The specimen containing the appropriate amount, 0.15 wt%, of MnO 2 exhibited the most outstanding properties: high permittivity (over 10,000), excellent temperature coefficient of capacitance (TCC) performance, the lowest dielectric loss (less than 1%), improved reliability and good capacitance stability. However, a high concentration of MnO 2 deteriorated the performance of the ceramic capacitors because of increasing of oxygen vacancies and associated defects.