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IJPAP Vol.43(02) [February 2005] >


Title: Infrared spectroscopic study of phase transitions in natural scolecite
Authors: Prasad, K Shiva
Prasad, P S R
Sharma, S R
Keywords: Zeolites
Scolecite
Dehydration
FTIR
Issue Date: Feb-2005
Publisher: CSIR
IPC CodeG01J 3/00
Abstract: In-situ infrared spectroscopic (FTIR) studies are carried out on a naturally occurring scolecite, from Deccan traps, in the temperature range 300-850 K. Five bands are observed at 3589, 3507, 3409, 3327, and 3232 cm-1 in the (OH) stretching mode region, and three bands at 1665, 1649 and 1591 cm-1 in the bending mode region indicating a more complex molecular interaction between H2O and network cations in scolecite. At around 500 K, stretching mode region is replaced with three band structure, and the bending mode region with a band around 1658 cm-1, indicating partial dehydration in scolecite. At around 720 K complete disappearance of infrared modes due to water molecules indicates total dehydration. X-ray diffraction (XRD) of the sample corroborates the transformation to amorphous phase at higher temperatures.
Page(s): 79-82
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Source:IJPAP Vol.43(02) [February 2005]

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