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Dehydration of natural stilbite; an in situ FTIR study

P. S. R. Prasad, K. Shiva Prasad and S. Ramana Murthy
Dehydration of natural stilbite; an in situ FTIR study
American Mineralogist (October 2005) 90 (10): 1636-1640


The dehydration behavior of a natural stilbite sample from Poona (India) was investigated by in situ FTIR. The thermal induced variations of the water molecule bending (nu (sub 2) ) mode around 1653 cm (super -1) , the stretching (nu (sub 3) and nu (sub 1) ) modes around 3587 and 3426 cm (super -1) , and the corresponding second-order modes in the wavenumber region 4000-8000 cm (super -1) were followed as indicative of the dehydration process. The observed spectral variations indicate that stilbite undergoes a transformation at about 448 K due to the loss of half of the original content of water molecules. The rehydration of stilbite is partial in samples heated up to 630 K. Concerning both the dehydration and rehydration behaviors of stilbite, our results are in concert with those proposed in the literature. In addition, the growth of a new mode around 4550 cm (super -1) is observed in the temperature range 430-650 K and may indicate the presence of hydroxyl groups created by the breaking of the T-O-T linkages.

ISSN: 0003-004X
EISSN: 1945-3027
Serial Title: American Mineralogist
Serial Volume: 90
Serial Issue: 10
Title: Dehydration of natural stilbite; an in situ FTIR study
Affiliation: National Geophysical Research Institute, Hyderabad, India
Pages: 1636-1640
Published: 200510
Text Language: English
Publisher: Mineralogical Society of America, Washington, DC, United States
References: 25
Accession Number: 2006-008008
Categories: Mineralogy of silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
Secondary Affiliation: Osmania University, IND, India
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, copyright, Mineralogical Society of America. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 200604
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