Electrical Properties of the Li_0.03Na_0.97Ta_yNb_{1 – y}O₃ (y = 0.1–0.7) Ceramic Solid Solutions with a Perovskite Structure in the Region of the Antiferro-Ferroelectric Transition

The electrical properties (permittivity, dissipation factor, and electrical conductivity) of the Li_0.03Na_0.97Ta_yNb_{1 – y}O₃ (y = 0.1–0.7) ferroelectric solid solutions with a perovskite structure have been studied. In the temperature range of 290–830 K, the investigated solid solutions undergo three phase transitions. The phase transitions are strongly smeared with increasing tantalum concentration. The Curie temperatures have been established, and it has been shown that an increase in the tantalum concentration leads to a decrease in the Curie temperature. The static electrical conductivity of the Li_0.03Na_0.97Ta_yNb_{1 – y}O₃ (y = 0.1–0.7) ferroelectric solid solutions and the activation enthalpies of charge carriers have been determined.