Raman scattering and X-ray diffraction study of the thermal decomposition of an ettringite-group crystal |
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| Authors: | S K Deb M H Manghnani K Ross R A Livingston P J M Monteiro |
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| Institution: | (1) Hawaii Institute of Geophysics and Planetology, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA, US;(2) Department of Geology and Geophysics, University of Hawaii at Manoa, Honolulu, Hawaii 96822, USA, US;(3) Federal Highway Administration, 6300 Georgetown Pike, McClean Virginia 22101, USA, US;(4) Department of Civil and Environmental Engineering, University of California, Berkeley, California 94720, USA, US |
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| Abstract: | 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.
Received: 9 July 2001 / Accepted: 14 August 2002 |
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| Keywords: | Ettringite Raman scattering X-ray diffraction Thermal decomposition Dehydration |
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