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Evolución estructural impulsada por la entropía en los óxidos de cerámica

Shuo Liu1,2, Chaochao Dun2, Lin Xiong3

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Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron una cerámica de alta entropía de 25 elementos récord, demostrando cómo el aumento de la entropía estabiliza estructuras y propiedades cerámicas complejas. Esto hace avanzar el diseño de materiales para aplicaciones avanzadas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química del estado sólido
  • Ciencias de los materiales computacionales

Sus antecedentes:

  • Las cerámicas de alta entropía (HEC) ofrecen diversas propiedades debido a múltiples elementos que ocupan sitios cristalográficos al azar.
  • Exploración limitada de HEC con elementos diferentes debido a las barreras entálpicas que obstaculizan la estabilización entrópica.
  • Los HEC existentes a menudo contienen pocos elementos similares, lo que restringe la comprensión del papel de la entropía.

Objetivo del estudio:

  • Modelado y realización experimental de cerámicas complejas de alta entropía con una amplia gama de elementos.
  • Investigar la influencia del aumento de la entropía en el desorden estructural y de configuración de la cerámica.
  • Proporcionar información sobre la estabilización impulsada por la entropía de materiales cerámicos de composición compleja.

Principales métodos:

  • Modelado de la teoría funcional de la densidad (DFT) de las estructuras cristalinas de fluorita (1-10 elementos).
  • Síntesis experimental de nanoestructuras de óxido de fluorito con contenido variable de metales (1, 3, 8, 15 y 25 elementos).
  • Caracterización de las propiedades estructurales y térmicas en función de la composición elemental y la entropía.

Principales resultados:

  • Modelado y síntesis exitosos de HEC con hasta 25 elementos diversos, incluidas las tierras raras, las de transición, las alcalinas, el bloque p y los metales nobles.
  • Correlación demostrada entre el aumento de la entropía y el aumento del trastorno estructural/configuracional.
  • Se observaron alteraciones en la distorsión de la celosía, la cristalinidad, la homogeneidad, la densidad de los defectos y la estabilidad térmica con un aumento de la entropía.

Conclusiones:

  • La entropía juega un papel crucial en la estabilización de las cerámicas de composición compleja.
  • El HEC de 25 elementos desarrollado representa un récord en complejidad de composición.
  • Este trabajo amplía la comprensión y las aplicaciones potenciales de los materiales de alta entropía.