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Updated: Feb 6, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

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Transición de orden-desorden de aniones inducida por presión química en LnHO habilitada por la flexibilidad del

Hiroki Yamashita¹, Thibault Broux¹, Yoji Kobayashi¹

¹Graduate School of Engineering , Kyoto University , Kyoto 615-8510 , Japan.

Journal of the American Chemical Society

|August 22, 2018

Resumen

Los investigadores descubrieron transiciones de orden a desorden de aniones en los oxihidridos de lantánidos. Este hallazgo es crucial para aplicaciones que involucran difusión de hidrógeno, como la catálisis y los dispositivos electroquímicos de estado sólido.

Área de la Ciencia:

Química del estado sólido
Ciencias de los materiales
Química inorgánica

Sus antecedentes:

Las transiciones de orden-desorden catiónico están bien establecidas en la ciencia de los materiales.
Los análogos aniónicos que presentan transiciones similares son relativamente raros.
Los Lanthanide oxyhydrides (LnHO) ofrecen una plataforma potencial para estudiar el comportamiento de los aniones.

Objetivo del estudio:

Para sintetizar y caracterizar los nuevos lantánidos oxihidratos.
Investigar la ocurrencia y las fuerzas motrices de las transiciones aniónicas orden-desorden.
Explorar la relación entre el tamaño de los iones lantánidos y su disposición estructural.

Principales métodos:

Síntesis de los oxihidritos de los lantánidos (Ln = Sm, Gd, Tb, Dy, Ho, Er).
Difracción de rayos X para el análisis estructural.
Análisis de enlaces aniónicos y entornos de coordinación.

Principales resultados:

Se ha ampliado la serie conocida de LnHO para incluir Sm, Gd, Tb, Dy, Ho y Er.
Se observó una transición de estructuras ordenadas por aniones (P4/nmm) a estructuras desordenadas (Fm3̅m) con radio iónico Ln3+ decreciente.
Se ha identificado la subconexión de aniones de óxido en la fase desordenada como un factor determinante para el ordenamiento.
Demostró el papel de la flexibilidad del tamaño del anión hidruro en la transición.

Conclusiones:

Las transiciones de orden a desorden de aniones son alcanzables en los oxihidridos de lantánidos.
La transición es impulsada por la interacción entre el tamaño del ion lantánido y el enlace aniónico.
El control del orden aniónico en estos materiales es clave para aplicaciones en dispositivos de difusión de hidruro, catálisis y electroquímicos.

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