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The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
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Line Shape Analysis of Dynamic NMR Spectra for Characterizing Coordination Sphere Rearrangements at a Chiral Rhenium Polyhydride Complex
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Soluciones sólidas de renio/diboruro de tungsteno súper duras

Andrew T Lech, Christopher L Turner, Jialin Lei

  • 1Department of Mechanical and Nuclear Engineering, Virginia Commonwealth University , Richmond, Virginia 23284, United States.

Journal of the American Chemical Society
|October 11, 2016
PubMed
Resumen
Este resumen es generado por máquina.

El diboruro de renio (ReB2) permanece superduro incluso con hasta un 48% de tungsteno. Este descubrimiento amplía el potencial de los materiales estructurados con ReB2 en aplicaciones avanzadas.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química del estado sólido
  • La cristalografía

Sus antecedentes:

  • El diboruro de renio (ReB2) es un compuesto metálico superduro con una estructura única de capa de boro corrugado.
  • El diboruro de tungsteno (WB2) exhibe una estructura híbrida y no es superduro, lo que indica sensibilidad estructural a la superdureza.

Objetivo del estudio:

  • Investigar la estabilidad estructural y las propiedades mecánicas de las soluciones sólidas de diboruro de tungsteno-renio.
  • Determinar el límite de sustitución de tungsteno en la estructura ReB2 mientras se mantiene la superdureza.

Principales métodos:

  • Síntesis de soluciones sólidas de diboruro de tungsteno y de renio.
  • Radiografía de polvo y difracción de neutrones para el análisis estructural.
  • Pruebas de dureza por micro- y nanoindentación para la evaluación de las propiedades mecánicas.

Principales resultados:

  • La estructura de tipo ReB2 se mantiene para un contenido de tungsteno de hasta casi el 50% de átomos.
  • Los parámetros de la red aumentan linealmente con el contenido de tungsteno.
  • Todas las composiciones (0-48 átomos % W) exhiben superdureza, con el módulo de masa de la solución sólida de 48 átomos % comparable al ReB puro.

Conclusiones:

  • Las soluciones sólidas de diboruro de tungsteno-renio conservan la superdureza en un amplio rango de composiciones.
  • El tipo de estructura ReB2 está fuertemente asociado con propiedades superduras.
  • Se justifica una mayor investigación sobre soluciones sólidas y compuestos ternários relacionados.