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Mejora récord de la temperatura de Curie en la inclusión de anfitriones y invitados Ferroeléctricos
Xian-Jiang Song1, Tie Zhang1, Zhu-Xiao Gu1
1Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics, Southeast University, Nanjing 211189, People's Republic of China.
Journal of the American Chemical Society
|March 23, 2021
Resumen
Los investigadores desarrollaron un nuevo material ferroeléctrico multiaxial utilizando compuestos de inclusión huésped-invitado. Este material exhibe una temperatura de Curie récord de 415 K, superando las limitaciones de los ferroeléctricos moleculares anteriores para aplicaciones prácticas.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- La cristalografía
Sus antecedentes:
- Los compuestos de inclusión huésped-invitado son prometedores para los ferroeléctricos moleculares.
- Los materiales existentes a menudo sufren de bajas temperaturas de Curie y propiedades uniaxiales, lo que limita las aplicaciones.
- El desarrollo de materiales ferroeléctricos de alto rendimiento es crucial para los dispositivos electrónicos avanzados.
Objetivo del estudio:
- Para diseñar y sintetizar una alta temperatura, el anfitrión multiaxial de la inclusión ferroeléctrica.
- Investigar el efecto de la ingeniería aniónica en las propiedades ferroeléctricas.
- Para lograr una temperatura de Curie significativamente mejorada para aplicaciones prácticas.
Principales métodos:
- Análisis de la estructura cristalina y regulación de aniones para el control de la "coincidencia de impulso".
- Síntesis del nuevo compuesto ferroeléctrico [(MeO-C6H4-NH3)
- Caracterización de las propiedades ferroeléctricas dependiente de la temperatura, incluida la determinación de la temperatura de Curie.
Principales resultados:
- Se ha diseñado con éxito un ferroeléctrico de inclusión anfitrión-invitado multiaxial, [(MeO-C6H4-NH3) (((18-crown-6) ], con la notación Aizu mmmFm.
- Logró una temperatura de Curie (Tc) récord de 415 K, superando la de BaTiO3.
- Demostró un aumento significativo de la temperatura de 288 K en comparación con el compuesto de origen.
Conclusiones:
- La ingeniería aniónica es una estrategia efectiva para mejorar la temperatura de Curie e introducir la multiaxialidad en las ferroeléctricas de inclusión huésped-invitado.
- El material desarrollado exhibe el Tc más alto entre los ferroeléctricos basados en éter de corona informados, ofreciendo un amplio rango de temperatura de trabajo.
- Esta investigación proporciona una vía para el diseño de ferroeléctricos moleculares avanzados para aplicaciones en el almacenamiento de datos, detección y accionamiento.
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