弛豫铁电陶瓷Ba(Mg,Nb)O3的制备及性能研究

摘要

Relaxor-type ferroelectric perovskites attract a lot of attentions due to their excel-lent dielectric and microwave properties. Ba(Mg, Nb)O3 (BMN) ceramics have been synthesized from oxides by sintering in airs using a conventional mixed oxide process. From the study of XRD patterns, it is found that the amount of the perovskite phase increases with the increasing amount of La2O3. Furthermore, by the X-ray photoelectron spectroscopy (XPS) analyzation, it is discov-ered that the amount of Nb4+ is increased as La2O3 dopants increase from 0 to 0.04.%采用传统陶瓷烧结方法,在空气气氛下烧结制得Ba(Mg,Nb)O3(BMN)陶瓷,并分析了烧结温度对体系相组成及相结构的影响.X射线衍射(XRD)研究表明,随着烧结时间的增加,体系中钙钛矿相也相应增加.红外(FTIR)研究研究表明结构无序的BMN钙钛矿相中部分的区域出现了结构有序现象.通过X射线光电子能谱(XPS)可以发现,随着烧结温度的增加,体系中Nb2O5进入Ba(Mg1/3,Nb2/3)O3晶格.微波介电性能表明,随着烧结温度的增加,Ba(Mg,Nb)O3的∈r和Qf值有逐渐增加的趋势.