Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10625985 | Ceramics International | 2013 | 5 Pages |
Abstract
Microwave dielectric properties of corundum-structured Mg4Ta2O9 ceramics were investigated as a function of sintering temperatures by an aqueous sol-gel process. Crystal structure and microstructure were examined by X-ray diffraction (XRD) technique and field emission scanning electron microscopy (FE-SEM). Sintering characteristics and microwave dielectric properties of Mg4Ta2O9 ceramics were studied as a function of sintering temperature from 1250 °C to 1450 °C. With increasing sintering temperature, the density, εr and Qf values increased, saturating at 1300 °C with excellent microwave properties of εr=11.9, Qf=195,000 GHz and Ïf=â47 ppm/°C. Evaluation of dielectric properties of Mg4Ta2O9 ceramics were also analyzed by means of first principle calculation method and ionic polarizability theory.
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Authors
Q.J. Mei, C.Y. Li, J.D. Guo, S.X. Huang, X.H. Zhang, H.T. Wu,