摘要
采用纳米Nd2O3以较低温度烧结出性能优良的Ba6-3xNd8+2xTi18O54(BNT)微波介质陶瓷。以X-射线衍射法测定了BNT陶瓷粉末的室温点阵常数,确定其空间群为Pbam。分析了BNT晶格结构随配比x的变化情况,与Ba6-3xSm8+2xTi18O54(BST)、Ba6-3xEu8+2xTi18O54(BET)进行比较,结果表明各离子在ab晶面内的分布对Ba6-3xR8+2xTi18O54(BRT)微波介电性能的影响较大。给出了BRT介电常数和品质因数变化的可能解释,即BRT因配比x及稀土元素的不同而产生晶格变化所致。
Perfectly-sintered Ba6-3xNd8＋2xTi18O54 （BNT） microwave dielectric ceramics was fabricated with nano Nd2O3 at lower temperature by traditional method. The lattice parameters of BNT ceramic powders were determined by method of X-ray diffraction in ordinary temperature, and its orthorhombic lattice type （space group Pbam） was also determined. The change of BNT crystal structure with that of parameter x was analyzed, and was compared with X-ray diffraction data of Ba6-3xNd8＋2xTi18O54 （BST） and Ba6-3xEu8＋2xTi18O54 （BET）. The results show that the ionic distributions at ab crystal plane have more important effect on BRT＇s microwave dielectric properties. The changes of dielectric constant and quality factor of BRT may be caused by those of crystal structure due to changes of parameter x and different rare earth element R.
出处
《压电与声光》
CSCD
北大核心
2008年第1期71-74,共4页
Piezoelectrics & Acoustooptics
基金
国家自然科学基金资助项目(20571067)
浙江省自然科学基金资助项目(Y404017)
作者简介
李正法（1977-），男，山东沂水人，讲师，博士生，研究方向：功能材料与结构。
