Solid-Phase Synthesis and Dielectric Properties of Materials Based on LaAlO3–CaTiO3 System

Resumo

Effect of synthesis conditions on the formation and dielectric characteristics of materials based on the La_0.33Ca_0.67Al_0.33Ti_0.67O₃ phase was studied. It is shown that the new approach suggested in the study to obtaining ceramic materials based on the LaAlO₃–CaTiO₃ system via introduction of an excess amount of Al₂O₃ over the stoichiometry of L_a0.33Сa_0.67Ti_0.67Al_0.33O₃ results in that a finely grained material is formed with relative permeability ε = 45, temperature coefficient of the relative permittivity τ_ε =–66 × 10^–6 K^–1, dielectric losses tan δ = 2 × 10^–4, and quality factor Q = 4700 at f = 9 GHz. The functional characteristics of the resulting material are comparable with the parameters of the materials synthesized by chemical coprecipitation and indicate that its use in elements of microwave electronics is promising.