Abstract
The microwave dielectric characteristics of (1-x)(Al 1/2 Ta 1/2 )O₂-x(Mg 1/3 Ta 2/3 )O₂ (0≤x≤1.0) ceramics were investigated by crystal structure, variations of ionic polarizability, and microstructures. As x increased, (1-x)(Al 1/2 Ta 1/2 )O₂-x(Mg 1/3 Ta 2/3 )O₂ transformed to tetragonal structure. Because the ionic radius of [Mg 1/3 Ta 2/3 ] 4+ was slightly bigger than one of [Al 1/2 Ta 1/2 ] 4+ , the cell parameters increased with increase of (Mg 1/3 Ta 2/3 )O₂ concentration and coincided with prediction of the molecular additivity rule. As x increased, the compositions revealed ordered phase and were of single phase above 60 mol%. The increase of the ordered phase and grain size enhanced the Q and when ordering was completed at x over 0.6, the grain size was major factor for the increase in the Q. Though the grain size increased, however, the porosity deteriorated the Q. Therefore, the Q depended on the order/disorder, the porosity, and the grain size in regular order.
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