Experimental Characterization of High-Entropy Oxides with In Situ High-Temperature X-Ray Diffraction Techniques

Musicó, Brianna L.; Delzer, Cordell; Salasin, John Robert; Köehler, Michael; Rawn, Claudia J.

doi:10.1007/978-3-030-77641-1_9

High-Entropy Materials: Theory, Experiments, and Applications 2021

DOI: 10.1007/978-3-030-77641-1_9

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Experimental Characterization of High-Entropy Oxides with In Situ High-Temperature X-Ray Diffraction Techniques

Brianna L. Musicó

Cordell Delzer

John Robert Salasin

et al.

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Cited by 2 publications

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“…Like most oxide materials, the lattice distortion, element distribution, strain, surface reconstruction, and oxygen vacancies of HEOs can further modify the mechanical, thermal, , chemical, and electronic properties . Advanced imaging methods, including an X-ray-based technique, ,− scanning electron microscopy (SEM), − and scanning transmission electron microscopy (STEM), ,, have been applied to study these structural characters as well as the structure–property correlations in HEOs. − However, rationally tuning the morphology and structure of HEOs usually requires controlling the formation kinetics, which remains challenging due to the limited understanding of the material growth mechanisms.…”

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confidence: 99%

Visualizing the Formation of High-Entropy Fluorite Oxides from an Amorphous Precursor at Atomic Resolution

Chen

et al. 2022

ACS Nano

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High-entropy oxides (HEOs) have a large tuning space in composition and crystal structures, offering the possibility for improved material properties in applications including catalysis, energy storage, and thermal barrier coatings. Understanding the nucleation and growth mechanisms of HEOs at the atomic scale is critical to the design of their structure and functions but remains challenging. Herein, we visualize the entire formation process of a high-entropy fluorite oxide from a polymeric precursor using atomic resolution in situ gas-phase scanning transmission electron microscopy. The results show a four-stage formation mechanism, including nucleation during the oxidation of a polymeric precursor below 400 °C, diffusive grain growth below 900 °C, liquid-phase-assisted compositional homogenization under a “state of supercooling” at 900 °C, and entropy-driven recrystallization and stabilization at higher temperatures. The atomistic insights are critical for the rational synthesis of HEOs with controlled grain sizes and morphologies and thus the related properties.

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confidence: 99%

Visualizing the Formation of High-Entropy Fluorite Oxides from an Amorphous Precursor at Atomic Resolution

Chen

et al. 2022

ACS Nano

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What is in a name: Defining “high entropy” oxides

et al. 2022

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High entropy oxides are emerging as an exciting new avenue to design highly tailored functional behaviors that have no traditional counterparts. Study and application of these materials are bringing together scientists and engineers from physics, chemistry, and materials science. The diversity of each of these disciplines comes with perspectives and jargon that may be confusing to those outside of the individual fields, which can result in miscommunication of important aspects of research. In this Perspective, we provide examples of research and characterization taken from these different fields to provide a framework for classifying the differences between compositionally complex oxides, high entropy oxides, and entropy stabilized oxides, which is intended to bring a common language to this emerging area. We highlight the critical importance of understanding a material’s crystallinity, composition, and mixing length scales in determining its true definition.

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Experimental Characterization of High-Entropy Oxides with In Situ High-Temperature X-Ray Diffraction Techniques

Cited by 2 publications

References 26 publications

Visualizing the Formation of High-Entropy Fluorite Oxides from an Amorphous Precursor at Atomic Resolution

Visualizing the Formation of High-Entropy Fluorite Oxides from an Amorphous Precursor at Atomic Resolution

What is in a name: Defining “high entropy” oxides

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