高介电陶瓷Ag_(0.9)A_(0.1)(Nb_(0.8)Ta_(0.2))O_3(A=Li,Na,K)的研究  

STUDY OF HIGH PERMITTIVITY CERAMICS OF Ag_(0.9)A_(0.1)(Nb_(0.8)Ta_(0.2))O_3(A=Li,Na,K)

作　　者：郭秀盈[1] 肖谧[1] 吴霞宛[1] 张之圣[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《硅酸盐学报》2005年第11期1418-1421,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50402011);天津市自然科学基金(33608911);天津大学留学回国人员基金资助项目

摘　　要：采用传统的固相合成法制备了Ag(Nb0.8Ta0.2)O3(ANT)和Ag0.9A0.1(Nb0.8Ta0.2)O3(A=Li,Na,K)样品,并通过X射线衍射,扫描电镜和Raman光谱等手段对样品进行了表征。研究了Li+,Na+,K+取代Ag(Nb0.8Ta0.2)O3中的少量Ag+(摩尔比10%)对其介电性能的影响。结果表明:由于Li+,K+与Ag+半径差较大,它们的取代样品中出现了钙钛矿相以外的杂相峰,与未取代样品(ANT)相比介电常数(ε)和介电损耗(tgδ)变大;Na+取代样品的X射线衍射谱中只呈现单一的钙钛矿相特征峰,其,εtgδ较未经取代样品(ANT)的值略有减小。Ceramics of Ag（Nb0.8Ta0.2）O3（ANT） and Ag0.9A0.1 （Nb0.8Ta0.2）O3（A=Li, Na, K） were synthesized by the traditional solid method and were characterized by X-ray diffraction, scanning electron microscopy and Raman spectra. The effects of Li^＋ , Na^＋ and K^＋ substitution for small amounts of Ag^＋ （in mole ratio 10% ） of Ag（Nb0.8Ta0. 2 ）O3 on the ceramics＂ dielectric properties were studied. The results show that the peaks of other phases besides the perovskite feature peaks appear in Li^＋ and K^＋ substituted samples due to the ions radius difference between Li^＋ , K^＋ and Ag^＋. Compared with ANT, the dielectric constant （ε） and dissipation factor （tgδ） of the Li^＋ and K^＋ substituted samples are increased. However, the X-ray diffraction patterns of Na^＋ substituted samples only show the peaks of the perovskite structure, and their ε and tgδ values are a little lower than that of ANT.

关 键 词：钽铌酸银 添加剂 介电性能 

分 类 号：TQ174[化学工程—陶瓷工业]