Structure and microwave dielectric properties of Ba3(VO4)2-Zn2-xSiO4-x ceramic composites

被引:27
|
作者
Lv, Yang [1 ]
Zuo, Ruzhong [1 ]
Yue, Zhenxing [2 ]
机构
[1] Hefei Univ Technol, Sch Mat Sci & Engn, Inst Electro Ceram & Devices, Hefei 230009, Peoples R China
[2] Tsinghua Univ, Dept Mat Sci & Engn, State Key Lab New Ceram & Fine Proc, Beijing 100084, Peoples R China
基金
中国国家自然科学基金;
关键词
Ceramics; Composites; Raman spectroscopy; Dielectric properties; MIXTURE BEHAVIOR; LTCC; RATIO;
D O I
10.1016/j.materresbull.2013.02.014
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Microwave dielectric ceramic composites with compositions of (1 - y)Ba-3(VO4)(2)-yZn(2-x)SiO(4-x) (y = 0.4-0.6, x = 0.13) have been prepared by firing mixtures of Ba-3(VO4)(2) and Zn1.87SiO3.87. The X-ray diffraction (XRD) analysis revealed that Zn2SiO4 with a willemite phase can be obtained by appropriately controlling the ZnO deficiency. The starting Zn1.87SiO3.87 powder should be thus composed of the ZnSiO4 crystal phase and redundant SiO2 amorphous phase at room temperature. The scanning electron microscopy studies demonstrated the coexistence of Zn2SiO4 and Ba-3(VO4)(2) phases in the sintered bodies, as further confirmed by the XRD and Raman results. The near-zero temperature coefficients of the resonant frequency (tau(f)) could be achieved by adjusting the relative content of the two phases owing to their opposite tau(f) values. The existence of a slight amount of secondary phases, element interdiffusion and non-stoichiometry such as Zn deficiency altogether made the predicted property values deviate from the experimentally measured ones. The composite ceramics with 40 wt% Zn1.87SiO3.87 sintered at 1100 degrees C exhibited desirable microwave dielectric properties of the quality factor Q x f similar to 23,000 GHz, dielectric constant epsilon(r) similar to 9.3, and tau(f) similar to 0.4 ppm/degrees C. (C) 2013 Elsevier Ltd. All rights reserved.
引用
收藏
页码:2011 / 2017
页数:7
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