TY - JOUR
T1 - High-Entropy Oxides in the Mullite-Type Structure
AU - Kirsch, Andrea
AU - Bøjesen, Espen Drath
AU - Lefeld, Niels
AU - Larsen, Rasmus
AU - Mathiesen, Jette Katja
AU - Skjærvø, Susanne Linn
AU - Pittkowski, Rebecca Katharina
AU - Sheptyakov, Denis
AU - Jensen, Kirsten M. Ø.
PY - 2023
Y1 - 2023
N2 - 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., Bi2(Al0.25Ga0.25Fe0.25Mn0.25)4O9 and A2Mn4O10 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.
AB - 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., Bi2(Al0.25Ga0.25Fe0.25Mn0.25)4O9 and A2Mn4O10 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.
U2 - 10.1021/acs.chemmater.3c01830
DO - 10.1021/acs.chemmater.3c01830
M3 - Journal article
C2 - 37901145
SN - 0897-4756
VL - 35
SP - 8664
EP - 8674
JO - Chemistry of Materials
JF - Chemistry of Materials
IS - 20
ER -