The polarization characteristics of (Ba Ca)TiO/sub 3/ dielectrics

(Ba/sub 0.85/Ca/sub 0.15/)TiO/sub 3/-MnO/sub 2/ and (Ba/sub 0.85/Ca/sub 0.15/)TiO/sub 3/-ZnO dielectrics were studied on microstructure and dielectric constant. The microstructure shows that (Ba/sub 0.85/Ca/sub 0.15/)TiO/sub 3/-MnO/sub 2/ ceramic dielectrics become polycrystalline structure by formation of BaMnO/sub 3/. The temperature coefficient of (Ba/sub 0.85/Ca/sub 0.15/)TiO/sub 3/-MnO/sub 2/ were less than 100[ppm] at 0.12 [kHz]. The dielectric relaxation time was increased by space charge polarization of paraelectric layer below 110[/spl deg/C] but it was decreased by interface polarization above 110[/spl deg/C]. The time constant value was high when the grain size was large and the charging current was higher than discharge current.