CETMIC   05378
CENTRO DE TECNOLOGIA DE RECURSOS MINERALES Y CERAMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Temperature-induced structural phase transitions in a clay aluminosilicate system. Al K-edge XANES as a probe for crystalline? to non crystalline?cristalline transformations.
Autor/es:
L. ANDRINI; N. RENDTORFF; E. AGLIETTI; F.G. REQUEJO
Lugar:
Karlsruhe
Reunión:
Conferencia; XAFS16, International Conference On X-Ray Absorption Fine Structures; 2015
Institución organizadora:
Karlsruhe Institute of Technology (KIT) in close collaboration with Helmholtz-Institutes DESY (Hamburg) and HZB (Berlin)
Resumen:
Temperature-induced structural phase transitions in a clay aluminosilicate system. Al K-edge XANES as a probe for crystalline? to non crystalline?cristalline transformations.LEANDRO ANDRINI1, NICOLÁS M. RENDTORFF2, ESTEBAN F. AGLIETTI2, FÉLIX G. REQUEJO*11INIFTA-CCT La Plata, CONICET, FCE-UNLP, La Plata, Argentina, 2CETMIC-CCT La Plata, CONICET, Dep. Química, FCE-UNLP, La Plata, Argentina, *requejo@fisica.unlp.edu.arSummary. The thermal transformations of kaolinite in kaolin clays include dehydroxylation to Metakaolin (MK) at around 600 °C, followed by the transformation to a low crystallinity phase: a silico-aluminate spinel (SAS) at around 980 °C. Finally mullite (M) is formed at temperatures between 1220 and 1300 °C. In this work we use Al K-edge XANES as a probe to study the aluminum local environment to establish the possible mediators of phase transformations including phases with low crystallinity non-detected by other techniques.