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Fabrication of Spatially Confined Complex Oxides

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La complejidad estructural y termodinámica de los óxidos de hierro impulsada por el tamaño.

Alexandra Navrotsky¹, Lena Mazeina, Juraj Majzlan

¹Peter A. Rock Thermochemistry Laboratory and Nanomaterials in the Environment, Agriculture, and Technology Organized Research Unit, University of California, Davis, CA 95616, USA. anavrotsky@ucdavis.edu

Science (New York, N.Y.)

|March 22, 2008

Resumen

Los óxidos de hierro a nanoescala, a menudo poco cristalinos, pueden ser más estables que los cristales más grandes debido a la energía superficial. Estos datos termodinámicos explican su aparición natural.

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Área de la Ciencia:

La geoquímica es la geoquímica.
Ciencia de los materiales Ciencia de los materiales.
Ciencias ambientales Ciencias ambientales.

Sus antecedentes:

Los óxidos de hierro están muy extendidos en la naturaleza y la tecnología, existiendo en diversas formas.
Muchos óxidos de hierro son nanofásicos, poco cristalinos y exhiben estados de hidratación variables.

Objetivo del estudio:

Revisar los datos termodinámicos recientes sobre la formación de óxido de hierro y las energías superficiales.
Comprender la estabilidad y la presencia de óxidos de hierro en diversos ambientes.

Principales métodos:

Resumen de los datos termodinámicos recientemente medidos.
Cálculo de los campos de estabilidad termodinámica para los óxidos y oxihidróxidos de hierro.

Principales resultados:

Se han recopilado datos termodinámicos sobre la formación y las energías superficiales de los óxidos de hierro.
Los polimorfos a nanoescala, metastables en tamaños más grandes, pueden estabilizarse termodinámicamente.

Conclusiones:

La energía superficial influye significativamente en la estabilidad de los óxidos de hierro a nanoescala.
Los cruces de estabilidad basados en el tamaño explican la prevalencia natural de fases específicas de óxido de hierro.