Crystal structure and dielectric properties of (1-x)Ca0.61Nd0.26TiO3+xNd(Mg1/2Ti1/2)O3 complex perovskite at microwave frequencies

被引:24
作者
Hu, Mingzhe [1 ]
Gu, Haoshuang [1 ]
Chu, Xiangcheng [2 ]
Qian, Jun [3 ]
Xia, Zhiguo [4 ]
机构
[1] Hubei Univ, Fac Elect Sci&Tech, Wuhan 430062, Hubei, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
[3] Guangxi Wuzhou Coll, Dept Math & Phys, Guangxi 530012, Peoples R China
[4] China Univ Geosci, Sch Mat Sci & Technol, Beijing 100083, Peoples R China
基金
美国国家科学基金会;
关键词
calcium compounds; ceramics; crystal structure; long-range order; neodymium compounds; permittivity; Q-factor; Raman spectra; short-range order; sintering; solid-state phase transformations; space groups; superlattices; X-ray diffraction;
D O I
10.1063/1.3043574
中图分类号
O59 [应用物理学];
学科分类号
摘要
The crystal structure and microwave dielectric properties of (1-x)Ca0.61Nd0.26TiO3+xNd(Mg1/2Ti1/2)O-3 (0 <= x <= 1.0) solid solutions incorporated with 1 wt % CuO were investigated. Pure perovskite phases were formed in the whole composition range, and the crystal space group and unit cell volume of the perovskites were analyzed based on x-ray diffraction patterns. The configuration of octahedral tilting and the B-site ordering phase transition between x=0.9 and 1.0 were unambiguously assigned, respectively, to the corresponding superlattice diffractions. Moreover, the two important fingerprints A(1g) mode and F-2g mode in Raman spectra, associated with the evolution of short range ordering and long range ordering of B-site cations, respectively, were further investigated by employing the full width at half-maximum and their Raman shifts to determine the degree of B-site ordering and the crystal bond strength in the perovskites. The microwave dielectric constants, quality factors, and temperature coefficients of resonant frequency of the solid solutions were elaborately investigated and correlated with their crystal structures. The microscopic structure-related thermal parameters in the solid solution were calculated using the Claussius-Mossotti equation to determine the original contributors in the temperature coefficients. Temperature compensated tau(f) value ceramics could be obtained in the range of 0.3 < x < 0.5. When sintered at 1400 degrees C for 2.5 h, a dielectric constant epsilon(r) of 39.9, a quality factor product of 12 600 GHz, and a tau(f) of -25.3 ppm/degrees C microwave dielectric ceramic were obtained in 0.5Ca(0.61)Nd(0.26)TiO(3)+0.5Nd(Mg1/2Ti1/2)O-3+1 wt % CuO composition.
引用
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页数:10
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