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Characterization of Ultra-fine Grained and Nanocrystalline Materials Using Transmission Kikuchi Diffraction
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El carbono grafítico en el meteorito de Allende: un estudio de microestructura.

P P Smith1, P R Buseck

  • 1Department of Geology, Arizona State University, Tempe 85251, USA.

Science (New York, N.Y.)
|April 17, 1981
PubMed
Resumen
Este resumen es generado por máquina.

El carbono en el meteorito de Allende es principalmente grafito de baja cristalinidad. Este grafito es significativo ya que lleva gases nobles isotópicamente anómalos que se encuentran en las condritas carbonáceas.

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Área de la Ciencia:

  • Cosmoquímica es la cosmoquímica.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Las condritas carbonáceas proporcionan información sobre los primeros materiales del sistema solar.
  • Comprender la forma y las propiedades del carbono es crucial para los estudios cosmoquímicos.

Objetivo del estudio:

  • Para caracterizar las propiedades microestructurales del carbono dentro de la condrita carbonácea de Allende.
  • Para identificar la forma de carbono que alberga gases nobles isotópicamente anómalos.

Principales métodos:

  • Se empleó microscopía electrónica de transmisión de alta resolución (HRTEM).
  • Análisis microestructural de materiales carbonosos.

Principales resultados:

  • El carbono en el meteorito de Allende es predominantemente grafito cristalino de baja calidad.
  • Este grafito poco cristalino es un portador significativo de gases nobles anómalos isotópicamente.

Conclusiones:

  • El estado microestructural del carbono influye en su papel en la preservación de los materiales presolares.
  • El grafito poco cristalino en las condritas carbonáceas es clave para comprender las anomalías de los gases nobles.