High Entropy Oxide Phases with Perovskite Structure

Denis A Vinnik; Evgeny A Trofimov; Vladimir E Zhivulin; Svetlana A Gudkova; Olga V Zaitseva; Dmitry A Zherebtsov; Andrey Yu Starikov; Darya P Sherstyuk; Abdulkarim A Amirov; Alexandr V Kalgin; Sergey V Trukhanov; Fedor V Podgornov

doi:10.3390/nano10020268

High Entropy Oxide Phases with Perovskite Structure

Nanomaterials (Basel). 2020 Feb 5;10(2):268. doi: 10.3390/nano10020268.

Authors

Denis A Vinnik¹, Evgeny A Trofimov¹, Vladimir E Zhivulin¹, Svetlana A Gudkova^{1

2}, Olga V Zaitseva¹, Dmitry A Zherebtsov¹, Andrey Yu Starikov¹, Darya P Sherstyuk¹, Abdulkarim A Amirov^{3

4}, Alexandr V Kalgin^{5

6}, Sergey V Trukhanov^{1

7

8}, Fedor V Podgornov¹

Affiliations

¹ Material science and physics&chemistry of materials, South Ural State University (National Research University), 454080 Chelyabinsk, Russia.
² Moscow Institute of Physics and Technology (State University), 141701 Dolgoprudny, Russia.
³ Immanuel Kant Baltic Federal University, 236041 Kaliningrad, Russia.
⁴ Amirkhanov Institute of Physics Daghestan Scientific Center, Russian Academy of Sciences, 360015 Makhachkala, Russia.
⁵ Voronezh State Technical University, 394000 Voronezh, Russia.
⁶ Voronezh State University, 394036 Voronezh, Russia.
⁷ National University of Science and Technology "MISIS", 119049 Moscow, Russia.
⁸ Scientific and Practical Materials Research Centre of NAS of Belarus, 220072 Minsk, Belarus.

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 Na_0.30K_0.07Ca_0.24La_0.18Ce_0.21TiO₃ and a cubic structure.

Keywords: high entropy phases; multicomponent oxides; perovskite; phase equilibria; solid-phase sintering.

Grants and funding

19-73-10046/Russian Science Foundation