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Comprender el papel de la entropía en los óxidos de alta entropía
Solveig S Aamlid1, Mohamed Oudah1, Jörg Rottler1,2
1Stewart Blusson Quantum Matter Institute, University of British Columbia, Vancouver, BC V6T 1Z4, Canada.
Journal of the American Chemical Society
|March 7, 2023
Resumen
Los óxidos de alta entropía (HEOs) exhiben propiedades únicas debido al trastorno de configuración. Entender la entropía
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
Sus antecedentes:
- Los óxidos de alta entropía (HEOs) son una clase de materiales caracterizados por un profundo trastorno de configuración.
- Este desorden surge de múltiples elementos que ocupan los mismos sitios cristalográficos, lo que lleva a una amplia gama de posibles composiciones.
- Los HEO pueden exhibir propiedades funcionales superiores en comparación con sus contrapartes convencionales menos desordenadas.
Objetivo del estudio:
- Establecer un marco para comprender el papel de la entropía configuracional en las IES.
- Abordar la brecha entre los descubrimientos experimentales y la caracterización teórica de la influencia de la entropía.
- Facilitar el diseño racional de nuevas instituciones de educación superior con propiedades adaptadas.
Principales métodos:
- Este trabajo de perspectiva revisa la literatura existente y los conceptos teóricos.
- Propone un marco para cuantificar la entropía de configuración en los sistemas HEO.
- Discute la relación entre la entropía, la estabilidad de fase y las propiedades funcionales.
Principales resultados:
- A menudo se subestima la magnitud de la entropía de configuración en los OES.
- El trastorno de configuración es un factor clave en la estabilización de nuevas fases en las OES.
- Comprender la entropía es crucial para desbloquear las propiedades funcionales superiores.
Conclusiones:
- Una comprensión más profunda del papel de la entropía es esencial para el avance de la investigación HEO.
- El marco propuesto tiene por objeto orientar futuras investigaciones experimentales y teóricas.
- El diseño racional de las OSE depende del dominio de los principios de la entropía de configuración.
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