Quantum para-electric SrTiO3 had given rise to many investigations because of its anomalous properties. Here, using the conventional solid-state reaction method, polycrystalline SrTiO3 ceramics having a pure cubic perovskite structure were fabricated. A dielectric loss peak was observed at around 450K and 100Hz which shifted to higher temperatures with increasing frequency. The typical high-temperature dielectric relaxation process was confirmed to be related to the oxygen vacancies within ceramics. More interestingly, a Cole–Cole fitting to loss peaks revealed a weaker correlation among oxygen vacancies for such dielectric materials compared with that of ferroelectrics.

Oxygen-Vacancy-Related High-Temperature Dielectric Relaxation in SrTiO3 Ceramics. X.Wang, X.Lu, C.Zhang, X.Wu, W.Cai, S.Peng, H.Bo, Y.Kan, F.Huang, J.Zhu: Journal of Applied Physics, 2010, 107[11], 114101