Correlation of crystal structure and microwave dielectric properties of Nd1.02(Nb1-xTax)0.988O4 ceramic

被引：27

作者：

Zhang, Ping ^{[1
]}

Zhao, Yonggui ^{[1
]}

Liu, Jian ^{[1
]}

Song, Zhenkun ^{[1
]}

Xiao, Mi ^{[1
]}

Wang, Xiuyu ^{[1
]}

机构：

[1] Tianjin Univ, Sch Elect & Informat Engn, Tianjin 300072, Peoples R China

来源：

DALTON TRANSACTIONS | 2015年 / 44卷 / 11期

关键词：

Ceramic materials - Crystal structure - X ray diffraction - Dielectric properties - Microwaves - Tantalum compounds - Neodymium compounds - Oxygen - Structural properties - Phase structure;

D O I：

10.1039/c5dt00020c

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The phase structures of Nd-1.02(Nb1-xTax)(0.988)O-4 ceramics were analyzed via multiphase structure refinement. The X-ray diffraction patterns of Nd-1.02(Nb1-xTax)(0.988)O-4 showed that the monoclinic fergusonite structure of NdNbO4 and a second phase NdTa7O19 were obtained. The oxygen octahedron distortion was investigated according to the supercell of the NdNbO4 ceramic. The correlations between packing fractions, bond valences and microwave dielectric properties were discussed. For the main phase NdNbO4, as the polarizabilities increased, the e increased. The Q x f value was mainly attributed to the packing fraction. With the increase of bond valence of the B-site and the oxygen octahedron distortion, the tau(f) value decreased. The substitution of Ta5+ for Nb5+ effectively influenced the microstructure and the microwave dielectric properties of NdNbO4 ceramics. Optimal microwave dielectric properties can be obtained for Nd-1.02(Nb0.94Ta0.06)(0.988)O-4 ceramics at x = 0.06.

引用

页码：5053 / 5057

页数：5

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