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Rare earth and transition metal based entropy stabilised perovskite type oxides

Sarkar, Abhishek and Djenadic, Ruzica and Wang, Di and Hein, Christina and Kautenburger, Ralf and Clemens, Oliver and Hahn, Horst (2018):
Rare earth and transition metal based entropy stabilised perovskite type oxides.
In: Journal of the European Ceramic Society, 38 (5), pp. 2318-2327. Elsevier Science Publishing, ISSN 09552219,
DOI: 10.1016/j.jeurceramsoc.2017.12.058,
[Article]

Abstract

Multicomponent oxides with perovskite type of structure containing up to 10 different cations in equiatomic amounts have been synthesised for the first time. Out of eleven systems synthesised, only six systems crystallised as single phase perovskite type compounds with random and homogenous cation distribution on the respective sites. The formation of phase pure 10-cationic system, (Gd0.2La0.2Nd0.2Sm0.2Y0.2)(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3, in contrast to the multiphase mixtures observed in five of the lower entropy systems (containing 6 cations) indicates a possible role of entropy in the stabilisation of a single phase crystal structure. The entropy driven structural stabilisation effect is further supported by the reversible phase transformation, from single phase to multiple phase upon cyclic heat treatment, observed in the (Gd0.2La0.2Nd0.2Sm0.2Y0.2)MnO3 system. This type of entropic signature has been observed in rocksalt based high entropy oxide systems. However, it has not been reported before for perovskite based compounds, as shown in this study.

Item Type: Article
Erschienen: 2018
Creators: Sarkar, Abhishek and Djenadic, Ruzica and Wang, Di and Hein, Christina and Kautenburger, Ralf and Clemens, Oliver and Hahn, Horst
Title: Rare earth and transition metal based entropy stabilised perovskite type oxides
Language: English
Abstract:

Multicomponent oxides with perovskite type of structure containing up to 10 different cations in equiatomic amounts have been synthesised for the first time. Out of eleven systems synthesised, only six systems crystallised as single phase perovskite type compounds with random and homogenous cation distribution on the respective sites. The formation of phase pure 10-cationic system, (Gd0.2La0.2Nd0.2Sm0.2Y0.2)(Co0.2Cr0.2Fe0.2Mn0.2Ni0.2)O3, in contrast to the multiphase mixtures observed in five of the lower entropy systems (containing 6 cations) indicates a possible role of entropy in the stabilisation of a single phase crystal structure. The entropy driven structural stabilisation effect is further supported by the reversible phase transformation, from single phase to multiple phase upon cyclic heat treatment, observed in the (Gd0.2La0.2Nd0.2Sm0.2Y0.2)MnO3 system. This type of entropic signature has been observed in rocksalt based high entropy oxide systems. However, it has not been reported before for perovskite based compounds, as shown in this study.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 38
Number: 5
Publisher: Elsevier Science Publishing
Uncontrolled Keywords: Spray pyrolysis, Multicomponent equiatomic perovskites, High entropy oxides, Structural distortion
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Fachgebiet Materialdesign durch Synthese
11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
Date Deposited: 12 Dec 2018 08:59
DOI: 10.1016/j.jeurceramsoc.2017.12.058
Official URL: https://doi.org/10.1016/j.jeurceramsoc.2017.12.058
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