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Ferroeléctricos basados en Bi_0.5Na_0.5TiO₃ con nanodominio concentrado altamente polarizable para el almacenamiento de

Xuefan Zhou¹, Zhimin Huang¹, Xiaogang Luo¹

¹Powder Metallurgy Research Institute, State Key Laboratory of Powder Metallurgy, Central South University, Changsha, Hunan 410083, China.

ACS applied materials & interfaces

|August 20, 2025

Resumen

Los investigadores desarrollaron nuevas cerámicas ferroeléctricas relajantes para el almacenamiento de energía de alto rendimiento. Estos materiales logran una excelente densidad y eficiencia de energía recuperable, crucial para aplicaciones electrónicas avanzadas y de energía portátil.

Área de la Ciencia:

Ciencias de los materiales
Física del estado sólido
Ingeniería cerámica

Sus antecedentes:

La alta densidad de energía recuperable simultánea (Wrec) y la eficiencia (η) en las cerámicas dieléctricas son críticas para la microelectrónica y los dispositivos portátiles.
Un desafío clave es lograr una alta polarización máxima (Pm) e histeresis de baja polarización simultáneamente bajo campos eléctricos bajos / moderados (E).

Objetivo del estudio:

Desarrollar nuevas cerámicas ferroeléctricas relajantes con capacidades mejoradas de almacenamiento de energía.
Para superar las limitaciones de la coexistencia de alta Pm e histeresis de baja polarización.

Principales métodos:

Modificación de iones ferroeléctricamente activos heterovalentes en un sistema de Bi0.47Na0.47Ba0.06TiO3-Sr(Fe0.5Nb0.5) O3.
Investigando los efectos sobre la polarizabilidad iónica promedio, la polarización espontánea y el orden ferroeléctrico.
Caracterizar el rendimiento de almacenamiento de energía, la permisividad (εr) y la pérdida dieléctrica.

Principales resultados:

Se ha logrado una histeresis de alta Pm y baja polarización en cerámicas de 0,80 ((Bi0.47Na0.47Ba0.06) TiO3-0.20Sr ((Fe0.5Nb0.5) O3).
Se obtiene un excelente almacenamiento de energía: Wrec = 6,17 J/cm3, η = 90,3% a 34 kV/mm.
Se ha demostrado que el εr es alto y estable a temperatura (2085 a 150 °C) con TCC ≤ 15% (18260 °C) y tanδ bajo (0,0075 a 150 °C).

Conclusiones:

El sistema cerámico modificado equilibra con éxito la alta polarización y la baja histeresis para un almacenamiento de energía superior.
Estas cerámicas muestran un potencial significativo para aplicaciones prácticas en sistemas de condensadores dieléctricos de almacenamiento de energía.
El material ofrece una solución prometedora para la próxima generación de dispositivos de almacenamiento de energía compactos y eficientes.

Palabras clave:

Bi0.5Na0.5TiO3 y sus derivados Relaxor Ferroeléctricos Respuesta dieléctrica almacenamiento de energía campos eléctricos moderados

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