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Carbonate-cancrinite: In-situ real-time thermal processes studied by means of energy-dispersive X-ray powder-diffractometry

Published online by Cambridge University Press:  10 January 2013

P. Ballirano ,
A. Maras ,
R. Caminiti  and
C. Sadun
P. Ballirano
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma La Sapienza, P.le Aldo Moro 5, I-00185, Roma, Italy
A. Maras
Affiliation:
Dipartimento di Scienze della Terra, Università di Roma La Sapienza, P.le Aldo Moro 5, I-00185, Roma, Italy
R. Caminiti
Affiliation:
Dipartimento di Chimica, Università di Roma La Sapienza, P.le Aldo Moro 5, I-00185, Roma, Italy
C. Sadun
Affiliation:
Dipartimento di Chimica, Università di Roma La Sapienza, P.le Aldo Moro 5, I-00185, Roma, Italy
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Abstract

New powder X-ray data for cancrinite [ideally Na8Si6Al6O24 (CO3)2·2 H2O] are reported along with in-situ real-time thermal processes recorded using energy dispersive X-ray diffractometry (EDXD). A completely anhydrous phase is obtained after heating the sample up to 600 °C and quickly cooling it to room temperature, as shown by means of both Rietveld analysis and IR spectroscopy. The anhydrous phase does not show any tendency to re-acquire molecular water. During the heating process, at around 450 °C, a peak splitting is observed, possibly due to a reversible phase transition.

Type
Research Article
Information
Powder Diffraction , Volume 10 , Issue 3 , September 1995 , pp. 173 - 177
Copyright
Copyright © Cambridge University Press 1995

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