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Multicomponent equiatomic rare earth oxides

Djenadic, Ruzica and Sarkar, Abhishek and Clemens, Oliver and Loho, Christoph and Botros, Miriam and Chakravadhanula, Venkata S. K. and Kübel, Christian and Bhattacharya, Subramshu S. and Gandhi, Ashutosh S. and Hahn, Horst (2017):
Multicomponent equiatomic rare earth oxides.
In: Materials Research Letters, 5 (2), pp. 102-109. Taylor Francis, ISSN 2166-3831,
[Article]

Abstract

Multicomponent rare earth oxide (REO) nanocrystalline powders containing up to seven equiatomic rare earth elements were successfully synthesized in a single-phase CaF2-type (Fm-3 m) structure. The addition of more than six elements resulted in the formation of a secondary phase. Annealing at 1000°C for 1 h led to the formation of a single-phase (Ia-3) even in the 7-component system. In the absence of cerium (Ce4+), secondary phases were observed irrespective of the number of cations or the extent of thermal treatment indicating that cerium cations played a crucial role in stabilizing the multicomponent REOs into a phase pure structure.

Item Type: Article
Erschienen: 2017
Creators: Djenadic, Ruzica and Sarkar, Abhishek and Clemens, Oliver and Loho, Christoph and Botros, Miriam and Chakravadhanula, Venkata S. K. and Kübel, Christian and Bhattacharya, Subramshu S. and Gandhi, Ashutosh S. and Hahn, Horst
Title: Multicomponent equiatomic rare earth oxides
Language: English
Abstract:

Multicomponent rare earth oxide (REO) nanocrystalline powders containing up to seven equiatomic rare earth elements were successfully synthesized in a single-phase CaF2-type (Fm-3 m) structure. The addition of more than six elements resulted in the formation of a secondary phase. Annealing at 1000°C for 1 h led to the formation of a single-phase (Ia-3) even in the 7-component system. In the absence of cerium (Ce4+), secondary phases were observed irrespective of the number of cations or the extent of thermal treatment indicating that cerium cations played a crucial role in stabilizing the multicomponent REOs into a phase pure structure.

Journal or Publication Title: Materials Research Letters
Journal volume: 5
Number: 2
Publisher: Taylor Francis
Uncontrolled Keywords: rare earth oxide, entropy, single phase, nanocrystalline
Divisions: 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
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 22 Mar 2017 10:11
Official URL: http://doi.org/10.1080/21663831.2016.1220433
Identification Number: doi:10.1080/21663831.2016.1220433
Funders: The authors would like to thank the Karlsruhe Nano Micro Facility (KNMF) for the access to the electron microscopy and spectroscopy unit.
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