Tailoring the microwave dielectric properties of MgNb2 O6 and Mg4Nb2O9 ceramics

被引：27
作者：
Materials and Minerals Division, Regional Research Laboratory, Trivandrum 695019, India [1 ]
机构：
[1] Materials and Minerals Division, Regional Research Laboratory
来源：
Int. J. Appl. Ceram. Technol. | 2007年 / 4卷 / 359-366期
关键词：
Ceramic materials;
D O I：
10.1111/j.1744-7402.2007.02151.x
中图分类号：
学科分类号：
摘要：
The columbites MgNb2O6, MgTa2 O6, and corundum-type Mg4Nb2 O9 ceramics were prepared by the conventional solid-state ceramic route. The structure and microstructure of the sintered samples were investigated by X-ray diffraction and scanning electron microscopic techniques. The microwave dielectric properties of the samples were measured by the resonance method in the frequency range 4-6GHz. The dielectric properties have been tailored by forming a solid solution between MgNb2O6 and MgTa2O6 and by the substitution of TiO2 for Nb2 O5 in both MgNb2O6 and Mg4 Nb2O9 ceramics. The Mg(Nb0.7 Ta1.3)O6 has εr=29, Qu × f =67800GHz, and τf=0.8ppm/°C and the MgO-(0.4)Nb2O5 -(1.5)TiO2 composition has εr=34.5, Qu × f =81300GHz, and τf=-2ppm/°C. © 2007 The American Ceramic Society.
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页码：359 / 366
页数：7
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