Energy Harvesting Devices Based on Solid Solutions of Barium Titanate-Zirconate and Silver Niobate

The paper demonstrates the results of a study of lead-free solid solutions of BaTi1-xZrxO3 modified with AgNbO3. Solid solutions, obtained by two-stage solid-phase synthesis, have high density, and show signs of coexistence of several crystallographic phases. Widely blurred maxima are observed on the dependencies of the dielectric constant, which may be a consequence of the close temperatures of the phase transitions in BaTi1-xZrxO3 and AgNbO3. Low concentrations of AgNbO3 lead to a significant change in the shape of the dielectric hysteresis loops compared to BaTi1-xZrxO3. At low concentrations of AgNbO3, optimal energy harvesting conditions are achieved, showing ~ 0.085 J \(\cdot\) cm−3 and ~ 77% at an external field of 2 kV. Further increase in concentration leads to a decrease in efficiency and the level of harvested power. It is expedient to use the obtained data to optimize the processes of production of multicomponent lead-free ceramics, based on BaTi1-xZrxO3, and to obtain materials in which various types of ferroordering coexist.