Synthesis, Crystal Structure, and Microwave Dielectric Properties of (Mg _{1− <i>x</i>} Co <i> _x </i> )Ta ₂ O ₆ Solid Solutions

Abstract

High‐dielectric‐constant and low‐loss ceramics in the (Mg 1− x Co x )Ta 2 O 6 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 (Mg 1− x Co x )Ta 2 O 6 ceramics tended to form a complete solid solution with a trirutile structure. In comparison with that of simple MgTa 2 O 6 , an enhanced grain growth can be achieved by substituting Mg with 0.05 mol% Co. It also leads to an increase in both the ɛ r and Q × f values of the ceramics. The specimen with x =0.05 possessed a combination of microwave dielectric properties: ɛ r ∼30.67, the Q × f ∼106 200 GHz, and τ f ∼42.9 ppm/°C.