Dielectric properties of (Mg(1-x)Cox) 4Ta2O9 (x = 0.01 to 0.09) prepared by solid state reaction were investigated. The maximum properties of the (Mg( 1-x)Cox)4Ta2O9 (x = 0.05) system were namely, an obtained εr value of 12.27, a Qxf value of 440,000 GHz, and a τf value of -59 ppm/°C sintered at 1325°C. The theoretical polarizability of (Mg(1-x)Co x)4Ta2O9 increased with Co substitution, x. (Mg(1-x)Cox)4Ta 2O9 with Mg2+ substituted by and Co 2+ not only improved the microwave dielectric properties, but also decreased sintering temperature. From the calculation of the covalency of cationoxygen bonds, it is found that the covalency of the CoO bond is lower than that of the MgO bond and the difference in the covalency between these cationoxygen bonds influences the temperature dependence of dielectric constant on the compounds. From our experiment, the best microwave dielectric property happens in (Mg0.95Co0.05)4Ta2O 9 sintered at 1325°C for 4 h, and it's Qxf is 440,000GHz with τf = 59.5 ppm/°C.
All Science Journal Classification (ASJC) codes
- Ceramics and Composites
- Condensed Matter Physics
- Materials Chemistry