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Synthesis, Crystal Structure, and Microwave Dielectric Properties of (Mg1−xCox)Ta2O6 Solid Solutions

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High-dielectric-constant and low-loss ceramics in the (Mg1−xCox)Ta2O6 solid solutions have been prepared using the conventional mixed oxide route and their microwave dielectric properties have been investigated. The X-ray diffraction patterns as well as the measured lattice parameters indicated the (Mg1−xCox)Ta2O6 ceramics tended to form a complete solid solution with a trirutile structure. In comparison with that of simple MgTa2O6, an enhanced grain growth can be achieved by substituting Mg with 0.05 mol% Co. It also leads to an increase in both the r and Q×f values of the ceramics. The specimen with x=0.05 possessed a combination of microwave dielectric properties: r∼30.67, the Q×f∼106 200 GHz, and f∼42.9 ppm/°C.

Document Type: Research Article


Affiliations: Department of Electrical Engineering, National Cheng Kung University, Tainan 70101, Taiwan

Publication date: February 1, 2010


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