Abstract
Tri-rutile structured A0.75Ti0.75Ta1.5O6 (ANi, Co, Mg, Zn) ceramics were synthesized using traditional solid reaction method. The crystal structures were studied by X-ray diffraction in conjunction with Rietveld refinement analysis. Based on the complex chemical bond theory and crystallographic data, some principle chemical bond characteristics such as bond ionicity, lattice energy, bond energy and coefficient of thermal expansion of complex A0.75Ti0.75Ta1.5O6 ceramics were obtained through quantitative calculation. The calculated results provided useful information to clarify the correlations between chemical bond characteristics and microwave dielectric properties of A0.75Ti0.75Ta1.5O6 ceramics. The dielectric constant was closely associated with the ionicity of TaO bond, and the Q × f values were correlated with the lattice energy of TaO bond. The τf values were affected by the bond energy of TaO bond and the coefficient of thermal expansion of AO bond.
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