Abstract
The process and the formation of new minerals upon heating the carbonate rocks containing clay minerals, together with calcite are determined with thermal analysis, X-ray diffraction, infrared and Raman spectroscopy. The calcite-calcium oxide phase transition sequence was followed up to 947 °C in naturally occurring limestone samples. The spectral variations of the internal modes of the carbonate trigonal ( ν 1, ν 2, ν 3 and ν 4) were used to probe the structural phase transitions. The calcium oxide phase (which on reaction with atmospheric water forms portlandite) with an onset temperature of around 950 °C was also characterized by the appearance of the infrared mode around 450 cm −1. The minerals, which were formed upon heating the calcite, were calcium oxide and wollastonite.
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Schedule a callMore From: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
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