Title :
The polarization characteristics of (Ba Ca)TiO3 dielectrics
Author :
Hong, Kyung-Jin ; Jung, Woo-Sung ; Min, Yong-Ki ; Kim, Tae-Sung
Author_Institution :
Cnonnam Univ., Kwangju, South Korea
Abstract :
(Ba0.85Ca0.15)TiO3-MnO2 and (Ba0.85Ca0.15)TiO3-ZnO dielectrics were studied on microstructure and dielectric constant. The microstructure shows that (Ba0.85Ca0.15)TiO3 -MnO2 ceramic dielectrics become polycrystalline structure by formation of BaMnO3. The temperature coefficient of (Ba0.85Ca0.15)TiO3-MnO2 were less than 100[ppm] at 0.12 [kHz]. The dielectric relaxation time was increased by space charge polarization of paraelectric layer below 110[°C] but it was decreased by interface polarization above 110[°C]. The time constant value was high when the grain size was large and the charging current was higher than discharge current
Keywords :
barium compounds; calcium compounds; ceramics; dielectric polarisation; dielectric relaxation; grain size; permittivity; space charge; (Ba0.85Ca0.15)TiO3-MnO2 ; (Ba0.85Ca0.15)TiO3-ZnO; 0.12 kHz; 110 C; additive; ceramic; dielectric constant; dielectric relaxation; grain size; interface polarization; microstructure; paraelectric layer; polycrystalline structure; space charge polarization; temperature coefficient; Barium; Ceramics; Dielectric constant; Dielectric materials; Microstructure; Polarization; Powders; Temperature; X-ray diffraction; Zinc oxide;
Conference_Titel :
Properties and Applications of Dielectric Materials, 1997., Proceedings of the 5th International Conference on
Conference_Location :
Seoul
Print_ISBN :
0-7803-2651-2
DOI :
10.1109/ICPADM.1997.616623
