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In-situ FTIR study of dehydration and rehydration mechanisms of natural scolecite

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In-situ FTIR spectroscopy was used to investigate the dehydration mechanism of naturally occurring scolecite from the Deccan traps. The dehydration and rehydration processes were studied by monitoring the thermally induced variations of fundamental bending (ν2) and stretching (ν3 and ν1) modes of the water molecules in the range 1550–1800 cm−1 and 3000–3600 cm−1, as well as the corresponding second-order modes in the wavenumber region 4000–8000 cm−1. Completely reversible spectral variations of the fundamental modes indicate that the transformation of scolecite to meta-scolecite at 495 K is reversible. Two-step dehydration behaviour is clearly observed in the thermally induced variations of the second-order modes. A combination mode in scolecite, due to Al-OH bonding around 4609 cm−1, is seen to disappear in the meta-scolecite phase. Growth of a new mode around 4485 cm−1 is observed in the temperature range 630–675 K, indicating the presence of hydroxyl groups in the amorphous phase, created by the breaking of T-O-T bonds.
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Keywords: DEHYDRATION MECHANISM; FTIR; NIR; REHYDRATION MECHANISM; SCOLECITE; ZEOLITE

Document Type: Research Article

Publication date: 2006-03-01

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  • The European Journal of Mineralogy publishes original papers, review articles and letters dealing with the mineralogical sciences s.l. These include primarily mineralogy, petrology, geochemistry, crystallography and ore deposits, as well as environmental, applied and technical mineralogy. Nevertheless, papers in any related field, including cultural heritage, will be considered.
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