Structure and dielectric characterization of the La(Mg_1/2Ti_1/2)O₃–Nd(Mg_1/2Ti_1/2)O₃ system

(1 − x)La(Mg_1/2Ti_1/2)O₃–xNd(Mg_1/2Ti_1/2)O₃  [0 ≤ x ≤ 1] ceramics were prepared from powders obtained by a non-conventional chemical route based on the Pechini method. La(Mg_1/2Ti_1/2)O₃ and Nd(Mg_1/2Ti_1/2)O₃ were found to form perovskite solid solutions in the whole compositional range. The structure of all the compositions was refined using the P2₁/n space group, which allows account of B-site ordering. The relative permittivity and temperature coefficient of the resonant frequency measured in the gigahertz range were analysed with respect to composition of the system. The non-monotonic dependence of the microwave quality factor on x was described qualitatively with the damped classical oscillator model and assuming 'two-mode' behaviour of the A ↔ BO₆ vibration mode in the solid solutions.