TU Darmstadt / ULB / TUbiblio

Nanocrystalline multicomponent entropy stabilised transition metal oxides

Sarkar, Abhishek and Djenadic, Ruzica and Usharani, Nandhini J. and Sanghvi, Kevin P. and Chakravadhanula, Venkata S.K. and Gandhi, Ashutosh S. and Hahn, Horst and Bhattacharya, Subramshu S. (2017):
Nanocrystalline multicomponent entropy stabilised transition metal oxides.
In: Journal of the European Ceramic Society, 37 (2), pp. 747-754. Elsevier Science Ltd, England, ISSN 09552219,
DOI: 10.1016/j.jeurceramsoc.2016.09.018,
[Article]

Abstract

Multicomponent entropy stabilised oxides containing four and five metal elements in equiatomic amounts were successfully synthesised in nanocrystalline form by nebulised spray pyrolysis (NSP), flame spray pyrolysis (FSP) and reverse co-precipitation (RCP) techniques, demonstrating that entropy stabilisation of these recently discovered materials is independent of the synthesis method. Both 4- and 5-cationic systems, (Co,Mg,Ni,Zn)O and (Co,Cu,Mg,Ni,Zn)O, can be stabilised into a single rocksalt structure directly only using NSP, while in FSP and RCP, stabilisation can be achieved after thermal treatment. This result indicates, that in 5-cationic NSP system configurational entropy is high enough to directly stabilise single rocksalt phase at lower temperature, while higher synthesis temperature is required to compensate the lower configurational entropy in 4-cationic system. Retention of single-phase at room temperature indicates sluggish diffusion kinetics, making entropy stabilised phases quenchable. (C) 2016 Elsevier Ltd. All rights reserved.

Item Type: Article
Erschienen: 2017
Creators: Sarkar, Abhishek and Djenadic, Ruzica and Usharani, Nandhini J. and Sanghvi, Kevin P. and Chakravadhanula, Venkata S.K. and Gandhi, Ashutosh S. and Hahn, Horst and Bhattacharya, Subramshu S.
Title: Nanocrystalline multicomponent entropy stabilised transition metal oxides
Language: English
Abstract:

Multicomponent entropy stabilised oxides containing four and five metal elements in equiatomic amounts were successfully synthesised in nanocrystalline form by nebulised spray pyrolysis (NSP), flame spray pyrolysis (FSP) and reverse co-precipitation (RCP) techniques, demonstrating that entropy stabilisation of these recently discovered materials is independent of the synthesis method. Both 4- and 5-cationic systems, (Co,Mg,Ni,Zn)O and (Co,Cu,Mg,Ni,Zn)O, can be stabilised into a single rocksalt structure directly only using NSP, while in FSP and RCP, stabilisation can be achieved after thermal treatment. This result indicates, that in 5-cationic NSP system configurational entropy is high enough to directly stabilise single rocksalt phase at lower temperature, while higher synthesis temperature is required to compensate the lower configurational entropy in 4-cationic system. Retention of single-phase at room temperature indicates sluggish diffusion kinetics, making entropy stabilised phases quenchable. (C) 2016 Elsevier Ltd. All rights reserved.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 37
Number: 2
Publisher: Elsevier Science Ltd, England
Uncontrolled Keywords: Spray pyrolysis, Reverse co-precipitation, Structural properties, Entropy Stabilisation, Nanocrystalline
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 > Joint Research Laboratory Nanomaterials
Date Deposited: 27 Jul 2017 08:58
DOI: 10.1016/j.jeurceramsoc.2016.09.018
Official URL: https://doi.org/10.1016/j.jeurceramsoc.2016.09.018
Identification Number: doi:10.1016/j.jeurceramsoc.2016.09.018
Funders: The authors would like to thank the Helmholtz Association (Germany) for financial support through the Helmholtz Portfolio Project "Electrochemical Storage in System - Reliability and Integration", Karlsruhe Nano Micro Facility (KNMF, Germany)., A. Sarkar acknowledges support of DAAD IIT/Master sandwich program 2015-16.
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)
Show editorial Details Show editorial Details