NdAlO_3掺杂对Ba_(4．2)Nd_(9．2)Ti_(18)O_(54)陶瓷微波介电性能的影响  

Effects of NdAlO_3 Additives on the Properties of Ceramics

作　　者：吕文中[1] 朱建华[1] Eric Rop Kipkoech 

机构地区：[1]华中科技大学电子科学与技术系,武汉430074

出　　处：《无机材料学报》2006年第1期139-144,共6页Journal of Inorganic Materials

基　　金：国家自然科学基金(60001002)

摘　　要：研究了NdAlO3掺杂对Ba4．2Nd9．2Ti18O54(简称BNT)陶瓷材料微观结构及其微波介电性能的影响．采用XRD和场发射扫描电子显微镜分析了掺NdAlO3后的BNT陶瓷材料的微观结构．结果表明,掺入的NdAlO3与Ba4．2Nd9．2Ti18O54形成了固溶体．随着NdAlO3 掺入量的增加,材料的介电常数和谐振频率温度系数逐渐减小,Q×f值先增大后减小．当 NdAlO3的掺入量为10wt％时,材料的Q×f值达到最大(11400GHz),谐振频率温度系数接近为零(-0．7ppm／℃),此时材料的相对介电常数为66．29(3．5GHz)．The effects of NdAlO3 additives on the microstructure and the dielectric properties of Ba4.2Nd9.2Ti18O54 （BNT） materials were investigated. The microstructure of BNT doped with NdAlO3 was analyzed by X-ray diffraction and FESEM. The results show that the solid solutions are formed between Ba4.2Nd9.2Ti18O54 and the NdAlO3 additives. The relative permittivity and the TCf values show a linear decrease with the increase of NdAlO3 additive. The Q values exhibit a non-linear behaviour and reach maximiun （11400GHz） for the NdAlO3 additive at approximately 10wt%, while the relative permittivity and the TCf values are 66.29 （3.5GHz） and -0.7ppm/℃, respectively.

关 键 词：微波介电性能 Ba4.2Nd9.2Ti18O54 NdAlO3 钨青铜矿结构 

分 类 号：TB321[一般工业技术—材料科学与工程]