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El nitridosilicato de europio de valencia mixta Eu2SiN3 es de valencia mixta.

Martin Zeuner1, Sandro Pagano, Philipp Matthes

  • 1Ludwig-Maximilians-Universität München, Department Chemie und Biochemie, D-81377 München, Germany.

Journal of the American Chemical Society
|July 21, 2009
PubMed
Resumen

Los investigadores sintetizaron el nitridosilicato de europio de valencia mixta Eu(2) SiN(3), revelando una nueva estructura de silicato tipo cadena. Este compuesto exhibe valencia mixta estática y ordenamiento ferromagnético a una temperatura inusualmente alta de 24 K.

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Área de la Ciencia:

  • Química del estado sólido.
  • Materiales inorgánicos Ciencia Ciencia de los materiales inorgánicos.
  • La cristalografía es una técnica de cristalografía.

Sus antecedentes:

  • Los compuestos de valencia mixta exhiben propiedades electrónicas y magnéticas únicas.
  • Los nitridosilicatos son una clase emergente de materiales inorgánicos con aplicaciones potenciales.
  • Comprender las relaciones estructura-propiedad en nuevos materiales es crucial para el descubrimiento de materiales.

Objetivo del estudio:

  • Para sintetizar y caracterizar el nuevo nitridosilicato de europio de valencia mixta, Eu(2)SiN(3).
  • Determinar la estructura cristalina e investigar las propiedades electrónicas y magnéticas de Eu(2)SiN(3).
  • Explorar el potencial de los nitridosilicatos como materiales funcionales avanzados.

Principales métodos:

  • Síntesis de Eu(2)SiN(3) a 900°C utilizando europio, diimida de silicio y un flujo de litio.
  • Análisis de difracción de rayos X de un solo cristal para determinar la estructura cristalina (Cmca, a = 542.3 ((11) pm, b = 1061.0 ((2) pm, c = 1162.9 ((2) pm).).
  • (151) Espectroscopia Eu Mössbauer, mediciones de susceptibilidad magnética y cálculos DFT para investigar las propiedades electrónicas y magnéticas.

Principales resultados:

  • La estructura cristalina revela una unidimensional infinita no ramificada dos cadenas de esquina compartiendo SiN(4) tetraedros.
  • Eu(2)SiN(3) exhibe valencia mixta estática con sitios equiatómicos Eu(2+) y Eu(3+), confirmados por espectroscopia Mössbauer.
  • El ordenamiento ferromagnético se observó a una temperatura inusualmente alta de T ((C) = 24 K, con una brecha de banda de aproximadamente 0,2 eV.

Conclusiones:

  • Eu(2)SiN(3) representa el primer silicato de cadena no ramificada en la clase de los nitridosilicatos.
  • El compuesto muestra propiedades magnéticas únicas debido a su naturaleza de valencia mixta y estructura cristalina.
  • Este descubrimiento abre nuevas vías para la investigación en materiales de nitridosilicato con funcionalidades electrónicas y magnéticas sintonizables.