Li_2O-Nb_2O_5-TiO_2微波介电陶瓷掺杂改性研究  

Study on Doping Modification of Microwave Dielectric Li_2O-Nb_2O_5-TiO_2 Ceramics

作　　者：余韶阳 李恩竹[1] 周晓华[1] 张树人[1] 

机构地区：[1]电子科技大学电子薄膜与集成器件国家重点实验室,四川成都610054

出　　处：《压电与声光》2014年第4期621-624,共4页Piezoelectrics & Acoustooptics

基　　金：中央高校基本科研业务费专项基金资助项目(No.A03007023801165)

摘　　要：采用传统的固相反应法制备Li-Al-B(LAB)掺杂立方晶系Li2O-Nb2O5-TiO2(LNT)微波介电陶瓷。运用XRD、SEM和微波介电性能测试等手段,研究了LAB掺杂对样品烧结性能及微波介电性能的影响。结果表明,在LNT陶瓷中添加LAB,有效促进LNT陶瓷烧结,使材料的介电常数和品质因数显著提高。当掺入LAB的质量分数为4%时,样品在900℃保温2h后烧结致密,并获得最佳微波性能:介电常数εr=18.05,品质因数与频率的乘积Q×f=22 040GHz(f=6.41GHz),频率温度系数τf=-20.74×10-6/℃。Li2O-Nb2O5-TiO2（LNT） microwave dielectric ceramics of cubic crystal system were synthesized by the traditional solid-state reaction method. The effects of LAB（Li-A1-B） doping on sintering character and electric properties of the samples were studied using XRD,SEM and microwave dielectric properties measurements. The re- suits show that adding LAB in the LNT ceramic will effectively promote the sintering,and significantly improve the dielectric constant and the quality factor. When the mass fraction of LAB reaches to 4% , the sample pellets were sin- tered at temperatures of around 900 ℃ for 2 h,and shows the best microwave performances of dielectric constant εr = 18.05 ,quality factor times frequency Q× f= 22 040 GHz（f= 6.41 GHz）, and temperature coefficient of fre- quency tf=20. 74× 10-6/℃.

关 键 词：Li2O-Nb2O5-TiO2(LNT) Li-Al-B(LAB) 微波陶瓷 介电性能 

分 类 号：TN384[电子电信—物理电子学] TM28[一般工业技术—材料科学与工程]