Doping Effects of Rare Earth on Dielectric Properties of Fine-Grained BaTiO₃-Based Ceramics

【Abstract】 The doping effects of rare earth oxides Ho₂O₃ and Er₂O₃ on dielectric properties of BaTiO₃-based ceramics were studied. After adding rare earth elements, grain growth in this system was inhibited and the grain size was reduced evidently which realized the fine-grained effect. In this system, the trivalent oxides Ho₂O₃ and Er₂O₃ were added to BaTiO₃ ceramics. The rare earth oxides do not enter into inner lattice totally to replace A or B sites. Some of additives can improve dielectric strength by forming nonferroelectric phases, and the rest maintained at grain boundaries controls overgrowth of grains. The dielectric constant at room temperature is increased up to 3000 and the curve of TCC becomes flat. Meanwhile, the dielectric strength E_b becomes higher.更多还原