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Aniones intercalados entre capas de aniones terminados: enlaces iónicos S-Se inusuales y superconductividad inducida
Ruijin Sun1,2, Shifeng Jin1,2, Lin Gu1,2
1Institute of Physics , Chinese Academy of Science , Beijing 100190 , China.
Journal of the American Chemical Society
|July 30, 2019
Resumen
Los investigadores desarrollaron un nuevo método para intercalar aniones en materiales en capas, creando nuevos compuestos. Este avance permitió la superconductividad en los calogenuros de hierro dopados por agujero por primera vez.
Área de la Ciencia:
- Ciencias de los materiales
- Química del estado sólido
- Superconductividad
Sus antecedentes:
- La intercalación aniónica es crucial para los materiales avanzados, pero es un desafío para los huéspedes ricos en aniones.
- El selenuro de hierro en capas (FeSe) presenta dificultades para la intercalación aniónica debido a sus capas externas aniónicas.
Objetivo del estudio:
- Desarrollar una nueva síntesis para intercalar aniones en materiales en capas.
- Para crear nuevos compuestos (Se/S) x ((NH3) yFe2Se2 con uniones anión-anión únicas.
- Para investigar el surgimiento de la superconductividad en estos nuevos compuestos intercalados.
Principales métodos:
- Se empleó la síntesis de intercambio iónico hidrotermal para intercalar aniones S y Se en FeSe.
- Caracterización de los cristales individuales resultantes, incluido el análisis de la unión y la transferencia de carga.
- Investigación de las propiedades superconductoras de los materiales sintetizados.
Principales resultados:
- Intercalación exitosa de aniones S y Se en capas de FeSe, formando nuevos compuestos (Se/S) x ((NH3) y Fe2Se2.
- Observación de enlaces anión-anión inusuales con fuertes características iónicas.
- Evidencia de transferencia de carga confirmada por estados elevados de oxidación de Fe y portadores de agujero dominantes.
- Aparición de superconductividad en los calogenuros de hierro dopados con agujero tras la intercalación S.
Conclusiones:
- Se ha establecido un método versátil de intercambio iónico hidrotermal para la intercalación aniónica.
- El estudio demuestra el potencial para la unión anión-anión y la transferencia de carga en materiales en capas.
- Este trabajo abre nuevas vías para explorar la intercalación aniónica y la superconductividad en materiales relacionados.
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