(Ni_(1/3)Nb_(2/3))_(1-x)Ti_xO_2微波介质陶瓷的组织结构及微波介电性能  

Microstructure and Microwave Dielectric Properties of(Ni_(1/3)Nb_(2/3))_(1-x)Ti_xO_2 Microwave Dielectric Ceramics

作　　者：蔡君德 傅仁利[1] 杨扬[1] 徐越[1] 费盟 刘超[1] 杨芳[1] 

机构地区：[1]南京航空航天大学,南京210016

出　　处：《人工晶体学报》2016年第3期618-622,共5页Journal of Synthetic Crystals

基　　金：江苏高校优势学科建设工程资助项目;广东省科技计划项目:广东省战略性新兴产业核心技术攻关(2011A091103002)

摘　　要：采用固相反应法制备金红石结构(Ni_(1/3)Nb_(2/3))_(1-x)Ti_xO_2(NNTO)(0.3≤x≤0.5)微波介质陶瓷,通过XRD、SEM、网络分析仪和激光拉曼光谱研究了组分变化对NNTO陶瓷显微结构、晶体结构和介电性能的影响。研究结果表明,随着x值减小,NNTO陶瓷气孔率和平均孔径增大。Ni^(2+)、Nb^(5+)含量增大将导致钛氧八面体畸变程度增大,晶胞体积增大,振动键能增强。在两者影响因素的共同作用下,NNTO陶瓷介电常数减小,品质因数增大,谐振频率温度系数降低。当Ni、Nb的取代量的摩尔含量为0.3 mol时,经过1150℃,2 h的烧结,所获得的NNTO陶瓷样品具有优异的微波介电性能:εr=69,Q×f=17431 GHz,τf=77 ppm/℃。The rutile structure( Ni_(1 /3)Nb_(2 /3))_(1- x)Ti_xO_2 microwave dielectric ceramics( NNTO) were prepared by solid state reaction method. The effects of composition variation on the microstructure,crystal and dielectric properties were investigated by XRD,SEM,VNA and Raman spectra. The results show that,with the decrease of x value,the porosity and average pore diameter of NNTO ceramic increase. When the substitution of Ni^(2 +),Nb^(5 +)increases,the oxygen octahedron distorts,and volume of the unit cell becomes bigger and vibrational bond energy increases. With the effect of both sides,the NNTO ceramic samples 'dielectric constant decreases,the Q × f value increases while the temperature coefficient of resonance frequency decreases. While x = 0. 3,sintered at 1150 ℃ for 2 h,the dielectric properties of NNTO ceramic samples are excellent: εr= 69,Q × f = 17431 GHz,τf= 77 ppm / ℃.

关 键 词：(Ni1/3Nb2/3)1-xTixO2陶瓷 拉曼光谱 固相反应法 微波介质陶瓷 

分 类 号：TQ174.1[化学工程—陶瓷工业]