Application of thermo-Raman spectroscopy to study dehydration of CaSO4.H2O and CaSO4.5H2O

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Title:	Application of thermo-Raman spectroscopy to study dehydration of CaSO4.H2O and CaSO4.5H2O
Authors:	Hua Chang;Pei Jane Huang;S. C. Hou
Contributors:	保健營養生技學系
Keywords:	Raman spectroscopy;Thermal analysis;Dehydration;CaSO4·2H2O;CaSO4·0.5H2O
Date:	1999-02
Issue Date:	2009-11-03 06:44:33 (UTC+0)
Abstract:	In this work, dehydration of CaSO4·2H2O and CaSO4·0.5H2O in stagnant air was studied by thermo-Raman spectroscopy from 25 to 300°C. The composition could be identified directly from the Raman spectra by comparing with the known Raman spectra of CaSO4·2H2O, CaSO4·0.5H2O and CaSO4. Thermo-Raman spectra indicated that dehydration of CaSO4·2H2O was a two step consecutive reaction and CaSO4·0.5H2O was the intermediate in the experimental conditions. The band intensities illustrated the variation in the relative amount of each species. The derivatives of the band intensities showed the maximum rate in dehydration of that species. The shifts in band positions also revealed the transformation.
Relation:	Materials Chemistry and Physics 58(1):12-19
Appears in Collections:	[Department of Food Nutrition and Healthy Biotechnology] Journal Article

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