Al^(3+)非化学计量比对CNTA陶瓷材料性能的影响  

Effect of the Nonstoichiometry of Al^(3+) on the Microwave Dielectric Properties of CNTA Ceramics

作　　者：童启铭[1] 钟朝位[1] 李攀敏[1] 庞翔[1] 肖勇[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》2012年第5期749-752,共4页Piezoelectrics & Acoustooptics

摘　　要：为满足NdAlO3-CaTiO3体系陶瓷材料(CNTA)的微波介电性能,用传统固相反应法制备了0.32NdAl(1+x)O3-0.68CaTiO3陶瓷材料。针对当x=-0.003,-0.002,-0.001,0,0.001,0.002,0.003时,研究了Al3+的非化学计量比对0.32NdAlO3-0.68CaTiO3微波介质陶瓷材料结构和性能的影响规律。结果表明,陶瓷结构均较致密,无气孔,晶界清晰,各组分的X线衍射峰基本一致,主晶相均为0.32NdAlO3-0.68CaTiO3。与x=0的配方葙相比,Al3+的变化导致材料的密度和品质因数与频率的乘积(Q×f)变大,微波介电常数(εr)减小。随着x由0向±0.003变化时,陶瓷材料的密度在x为-0.001和0.001时达到极值,分别为4.841g/cm3和4.884g/cm3。当x=0时,微波εr=45.13向两边递减,Q×f值分别在x为-0.001和0.001时达到极值,分别为36700和36600。To satisfy the requirements of NdAlO3-CaTiO3 microwave dielectric properties,0.32NdAl（1＋x）O3-0.68CaTiO3 ceramics were prepared by the solid state reaction method.The effect of the nonstoichiometry of Al3＋ on the property and structure of 0.32NdAlO3-0.68CaTiO3 ceramic for different x value （x=-0.001,-0.002,-0.003,0,0.001,0.002 and 0.003 respectively）.It is found that,the ceramic structure is dense,without pores,grain boundary definition,the components are basically the same X-ray diffraction,which is basically the same ingredients,the main phase is 0.32NdAlO3-0.68CaTiO3.Compared with the formula of x= 0,the changes of Al3＋ lead to the density and Q×f increase while the microwave dielectric constant （εr） decrease.As x changes from 0 to ±0.003,the density of ceramic materials reached the extreme of 4.841 g/cm3 and 4.884 g/cm3 respectively at x=±0.001.The microwave dielectric constant εr is 45.13 at x=0,and decrease to both sides.The value of reached the extreme of 36 700 and 36 600 respectively at x=± 0.001.

关 键 词：微波介质陶瓷 介电性能 固溶体 CATIO3 NdAlO3 

分 类 号：TM534[电气工程—电器]