Raman scattering and X-ray diffraction study of the thermal decomposition of an ettringite-group crystal

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• 作者：S. K. Deb ; M. H. Manghnani ; K. Ross ; R. A. Livingston and P. J. M. Monteiro
• 关键词：Keywords?Ettringite ; Raman scattering ; X ; ray diffraction ; Thermal decomposition ; Dehydration
• 刊名：Physics and Chemistry of Minerals
• 出版年：2003
• 出版时间：February 2003
• 年：2003
• 卷：30
• 期：1
• 页码：31-38
• 全文大小：164 KB
• 刊物类别：Earth and Environmental Science
• 刊物主题：Earth sciences
  Mineralogy
  Crystallography
  Geochemistry
  Mineral Resources
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1432-2021

文摘

?A Raman scattering and X-ray diffraction study of the thermal decomposition of a naturally occurring, ettringite-group crystal is presented. Raman spectra, recorded with increasing temperature, indicate that the thermal decomposition begins at ≈55 °C, accompanied by dehydration of water molecules from the mineral. This is in contrast to previous studies that reported higher temperature breakdown of ettringite. The dehydration is completed by 175 °C and this results in total collapse of the crystalline structure and the material becomes amorphous. The Raman scattering results are supported by X-ray diffraction results obtained at increasing temperatures.