Journal
MATERIALS RESEARCH LETTERS
Volume 5, Issue 2, Pages 102-109Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/21663831.2016.1220433
Keywords
Rare earth oxide; entropy; single phase; nanocrystalline
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Funding
- Helmholtz Association (Germany) through the Helmholtz Portfolio Project 'Electrochemical Storage in System-Reliability and Integration'
- DAAD-IIT Master-Sandwich programme
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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-3m) structure. The addition of more than six elements resulted in the formation of a secondary phase. Annealing at 1000 degrees 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. [GRAPHICS] IMPACT STATEMENT Multicomponent equiatomic rare earth oxides pioneer a new group of materials that crystallize into a single-phase structure with the dominant role of a single element instead of entropy.
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