High Entropy Oxide Phases with Perovskite Structure

Abstract

The possibility of the formation of high entropy single-phase perovskites using solid-state sintering was investigated. The BaO−SrO−CaO−MgO−PbO−TiO2, BaO−SrO−CaO−MgO−PbO−Fe2O3 and Na2O−K2O−CaO−La2O3−Ce2O3−TiO2 oxide systems were investigated. The optimal synthesis temperature is found between 1150 and 1400 °C, at which the microcrystalline single phase with perovskite structure was produced. The morphology, chemical composition, crystal parameters and dielectric properties were studied and compared with that of pure BaTiO3. According to the EDX data, the single-phase product has a formula of Na0.30K0.07Ca0.24La0.18Ce0.21TiO3 and a cubic structure.

Keywords

• phase equilibria
• multicomponent oxides
• high entropy phases
• perovskite
• solid-phase sintering