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K. BELGACEM1,* , PHI. LLEWELLYN2, K. NAHDI1, M.TRABELSI-AYADI1
Controlled transformation Rate Thermal Analysis (CRTA) has been used to study the thermal decomposition of a talc sample. The vacuum conditions and low rate of decomposition used in the present study has enabled to understand and quantify the decomposition in terms of the different brucite and talc sheets of the present mineral sample with chlorite impurity. Two mains decomposition steps at 500-650 °C and 650-1000 °C respectively were identified using CRTA, FTIR, XRD, SEM and BET analyses of heated talc at various temperatures. The first decomposition step, having the major duration, can be attributed to the deshydroxylation of the layers brucitic of chlorite while the second stage is due to the dehydroxylation of the layers mica (OH) of chlorite and of those of talc (OH). This result is in good agreement with the structure of both minerals (talc/chlorite) and also the arrangement of the hydroxyl groups.
Talc, Sample controlled thermal analysis, Chlorite.
K. BELGACEM, PHI. LLEWELLYN, K. NAHDI, M.TRABELSI-AYADI, Thermal behaviour study of the talc, Optoelectronics and Advanced Materials - Rapid Communications, 2, 6, June 2008, pp.332-336 (2008).
Submitted at: April 3, 2008
Accepted at: June 5, 2008
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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