High-Entropy Oxides in the Mullite-Type Structure.

Autor: Kirsch A; Department of Chemistry and Nanoscience Center, University of Copenhagen, Copenhagen 2100, Denmark., Bøjesen ED; Interdisciplinary Nanoscience Center & Aarhus University Centre for Integrated Materials Research, Aarhus University, Aarhus 8000, Denmark., Lefeld N; Institute of Inorganic Chemistry and Crystallography, University of Bremen, Bremen 28359, Germany., Larsen R; Interdisciplinary Nanoscience Center & Aarhus University Centre for Integrated Materials Research, Aarhus University, Aarhus 8000, Denmark., Mathiesen JK; Department of Chemistry and Nanoscience Center, University of Copenhagen, Copenhagen 2100, Denmark.; Department of Physics, Technical University of Denmark, Kgs. Lyngby DK-2800, Denmark., Skjærvø SL; Department of Chemistry and Nanoscience Center, University of Copenhagen, Copenhagen 2100, Denmark., Pittkowski RK; Department of Chemistry and Nanoscience Center, University of Copenhagen, Copenhagen 2100, Denmark., Sheptyakov D; Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, Villigen 5232, Switzerland., Jensen KMØ; Department of Chemistry and Nanoscience Center, University of Copenhagen, Copenhagen 2100, Denmark.
Jazyk: angličtina
Zdroj: Chemistry of materials : a publication of the American Chemical Society [Chem Mater] 2023 Oct 04; Vol. 35 (20), pp. 8664-8674. Date of Electronic Publication: 2023 Oct 04 (Print Publication: 2023).
DOI: 10.1021/acs.chemmater.3c01830
Abstrakt: High-entropy materials (HEMs) represent a new class of solid solutions containing at least five different elements. Their compositional diversity makes them promising as platforms for the development of functional materials. We synthesized new HEMs in a mullite-type structure and present five compounds, i.e., Bi 2 (Al 0.25 Ga 0.25 Fe 0.25 Mn 0.25 ) 4 O 9 and A 2 Mn 4 O 10 with variations of A = Nd, Sm, Y, Er, Eu, Ce, and Bi, demonstrating the vast accessible composition space. By combining scattering, microscopy, and spectroscopy techniques, we show that our materials are mixed solid solutions. Remarkably, when following their crystallization in situ using X-ray diffraction and X-ray absorption spectroscopy, we find that the HEMs form through a metastable amorphous phase without the formation of any crystalline intermediates. We expect that our synthesis is excellently suited to synthesizing diverse HEMs and therefore will have a significant impact on their future exploration.
Competing Interests: The authors declare no competing financial interest.
(© 2023 The Authors. Published by American Chemical Society.)
Databáze: MEDLINE
Externí odkaz: