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250102s2025 xx |||||o 00| ||eng c |
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|a 10.1002/adma.202417846
|2 doi
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|a eng
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| 100 |
1 |
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|a Zhuang, Lei
|e verfasserin
|4 aut
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|a Unveiling the Oxidation Mechanisms of High-entropy Carbides Through Atomic-scale Dynamic Observation
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|c 2025
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|a Text
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Revised 02.01.2025
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|a published: Print-Electronic
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|a Citation Status Publisher
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|a © 2025 Wiley‐VCH GmbH.
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|a Understanding the behavior of high-entropy carbides (HECs) under oxygen-containing environments is of particular importance for their promising applications in structural components, catalysis, and energy-related fields. Herein, the structural evolution of (Ta, Ti, Cr, Nb)C (HEC-1) nanoparticles (NPs) is tracked in situ during the oxidation at the atomic scale by using an open-cell environmental aberration-corrected scanning transmission electron microscope. Three key stages are clearly discerned during the oxidation of HEC-1 NPs at the atomic level below 900 °C: i) increased amorphization of HEC-1 NPs from 300 to 500 °C due to the energetically favorable formation of carbon vacancies and substitution of carbon with oxygen atoms; ii) nucleation and subsequent growth of locally ordered nanocluster intermediates within the generated amorphous oxides from 500 to 800 °C; and iii) final one-step crystallization of non-equimolar MeO2 and Me2O5 (Me = metallic elements, Ta, Ti, Cr, and Nb) high-entropy oxides above 800 °C, accompanied with the reduction in atomic defects. This result is further confirmed by theoretical calculations that these observed high-entropy oxide phases are thermodynamically preferable to generate above 830 °C. The study provides direct evidence of the ordered-disordered-ordered structural transition of HECs during oxidation
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|a Journal Article
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|a High‐entropy carbides
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|a atomic‐scale structural evolution
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|a in situ measurements
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|a oxidation mechanisms
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|a Wen, Zihao
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Liu, Yiwen
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yang, Jing
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yu, Hulei
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Chu, Yanhui
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Advanced materials (Deerfield Beach, Fla.)
|d 1998
|g (2025) vom: 02. Jan., Seite e2417846
|w (DE-627)NLM098206397
|x 1521-4095
|7 nnns
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| 773 |
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|g year:2025
|g day:02
|g month:01
|g pages:e2417846
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|u http://dx.doi.org/10.1002/adma.202417846
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