The dielectric and conductive properties of Bi3.25La0.75TiO3 ferro-electric films were investigated in the temperature range of 25 to 600C. A dielectric peak with a relaxation-type characteristic was observed around 400C. This peak could be greatly suppressed or eliminated by high sintering temperature or annealing in an O atmosphere (O2), and induced again by annealing in a reducing atmosphere (N2). The activation energy of dielectric relaxation and the characteristic relaxation time were estimated to be 1.89eV and 1.08 x 10–14s, respectively. In the corresponding temperature region, activation energy of conductivity was 0.65eV.

Single Ionized Oxygen Vacancy-Related Dielectric Relaxation in Bi3.25La0.75Ti3O12 Ferroelectric Films. N.Zhong, S.Okamura, K.Uchiyama, T.Shiosaki: Applied Physics Letters, 2005, 87[25], 252901 (3pp)