Influence of doped Ag+on multifunction characteristics in SrTiO3ceramics①
(1. State Key Laboratory of Advanced Technologyfor Materials Synthesis and Process;
2. Institute of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P.R.China)
2. Institute of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, P.R.China)
Abstract: SrTiO3capacitor-varistor multifunction ceramics is fabricated by a single-sintering process. The research is carried out, mainly aimed at the influence of the doped Ag+on multifunction characteristics in SrTiO3ceramics and its mechanism. The results show that the density of grain-boundary acceptor state increases effectively due to the fact that Sr2+on grain surface is substituted by doped Ag distributing at grain-boundary in form of Ag+during the course of oxidizing annealing, which is proposed to be the fundamental reason for understanding the significant difference of both the dielectric properties and varistor properties in SrTiO3ceramics samples with various Ag+contents.
Key words: SrTiO3ceramics; capacitor-varistor multifunction; Ag+doping