Dielectric Properties in the Insoluble Compositions of BaTiO3-CaTiO3 Ceramics
A conventional solid phase reaction method was followed to prepare (1−x)BaTiO3-xCaTiO3 based ceramics with content fractions ranging from x = 0.00 to 1.00. Phase segregation was observed when x exceeded 0.10. DC breakdown voltage (DC-BDV) abruptly changed at x = 0.30 and 0.85. Furthermore, the DC-BDV values of insoluble compositions (x = 0.30−0.85) were much higher than those of solubility limit (x = 0.20 and 0.90). Results obtained by investigation of the amount of absorbed current and the dependence of the rate of voltage increase for DC-BDV and AC-BDV confirmed the formation of space charge in insoluble compositions. This suggests that the dependence of the DC-BDV value for (1−x)BaTiO3-xCaTiO3 based ceramics was affected by the formation of space charge.
Kazumi Kato, Tadashi Takenaka, Masasuke Takata and Kazuo Shinozaki
K. Banno et al., "Dielectric Properties in the Insoluble Compositions of BaTiO3-CaTiO3 Ceramics", Key Engineering Materials, Vol. 388, pp. 225-228, 2009