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Observación del estado de transición para la conversión de BO3→BO4 inducida por presión en vidrio

Trenton Edwards¹, Takatsugu Endo¹, Jeffrey H Walton²

¹Division of Materials Science and Engineering, University of California at Davis, Davis, CA 95616, USA.

Science (New York, N.Y.)

|August 30, 2014

Resumen

La alta presión transforma la coordinación del boro en el vidrio. El boro y el boro.

Área de la Ciencia:

Ciencia de los materiales Ciencia de los materiales.
Química del estado sólido.
La geofísica es la geofísica.

Sus antecedentes:

Comprender los cambios inducidos por la presión en la estructura del vidrio es clave para adaptar las propiedades del material.
El entorno de coordinación del boro (BO3 a BO4) tiene un impacto significativo en las características físicas del vidrio.

Objetivo del estudio:

Para aclarar el mecanismo de estado de transición para la conversión de coordinación de boro inducida por presión (BO3→BO4) en vidrio de borosilicato.
Investigar el papel de la deformación anisotrópica bajo estrés isotrópico.

Principales métodos:

Espectroscopia de resonancia magnética nuclear (RMN) de estado sólido de boro-11 de alta presión in situ de hasta 2 gigapascals.
Cálculos ab initio para modelar el camino de transformación.

Principales resultados:

Deformación elástica anisotrópica observada del triángulo BO3 plano bajo tensión isotrópica.
Se identificó una pirámide trigonal como un probable precursor de la formación del tetraedro BO4.

Conclusiones:

El estudio revela un mecanismo detallado para los cambios estructurales inducidos por la presión en el vidrio de borosilicato.
Los hallazgos proporcionan información fundamental sobre la modificación de las propiedades del vidrio a través de cambios de coordinación inducidos por la presión.

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