Sb_2O_5和Bi_2O_3添加剂对Ag(Nb_(1-x)Ta_x)O_3陶瓷结构、形貌和性能的影响(英文)

EFFECT OF Sb_2O_5 AND Bi_2O_3 DOPING ON STRUCTURE, MORPHOLOGY AND PROPERTIES OF Ag(Nb_ (1-x)Ta_x)O_3 CERAMICS

研究了Sb2O5和Bi2O3添加剂对Ag(Nb1-xTax)O3陶瓷材料的结构、形貌和介电性能的影响。结果表明:当Sb2O5和Bi2O3的质量分数较少(<2.5%)时,不会影响Ag(Nb1-xTax)O3的钙钛矿结构,但能促进其烧结,使所得陶瓷样品更均匀致密。添加适量的Sb2O5和Bi2O3均可使Ag(Nb1-xTax)O3的介电常数(ε)增大,介电损耗(tgδ)减小,介电性能的温度稳定性得到改善。Bi2O3较Sb2O5对降低Ag(Nb1-xTax)O3陶瓷损耗及改善温度稳定性的效果更佳。

In order to synthesize Ag（Nb1-xTax）O3 ceramics with good dielectric properties effectively, effects of Sb2O5 and Bi2O3 doping on the crystal phase, microstructure and dielectric properties of Ag（Nb1-xTax）O3 ceramics were studied. The resuits show that small amounts of Sb2O5 and Bi2O3 doping （〈2.5%, in mass） can promote the sintering of Ag（Nb1-xTax）O3, but will not change its perovskite structure. And the sintered ceramics show a more uniform particle distribution and higher density. The dielectric constant （ε） of Ag（Nb1-xTax）O3 increases with the increasing of Sb2O5 and Bi2O3 amount. The proper amount of Sb2O5 and Bi2O3 can decrease the dissipation factor （tgδ） of Ag（Nb1-xTax）O3 and improve the temperature dependence of permittivity of Ag（Nb1-xTax）O3. The effect of Bi2O3 on the improvement of the dissipation factor and temperature dependence of permittivity for Ag（Nb1-xTax）O3 ceramic is better than that of Sb2O5.