Doping Effects of Rare Earth on Dielectric Properties of Fine-Grained BaTiO3-Based Ceramics
来源期刊：JOURNAL OF RARE EARTHS2003年第6期
论文作者：王洪儒 吴霞宛 张志萍 李玲霞 郭炜
Key words：inorganic materials; fine-grain effect; dielectric strength; Ho2O3; Er2O3; rare earths;
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 reduce devidently 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 Eb becomes higher.
王洪儒1，吴霞宛1，张志萍1，李玲霞1，郭炜1
(1.Department of Electronics Science and Technology, Tianjin University, Tianjin 300072, China)
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 reduce devidently 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 Eb becomes higher.
Key words:inorganic materials; fine-grain effect; dielectric strength; Ho2O3; Er2O3; rare earths;
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