Influence of water vapor pressure on the induction period during Li₂SO₄·H₂O single crystals dehydration

The dehydration of Li₂SO₄·H₂O single crystals at 80°C has been studied by means of both isothermal thermogravimetry at 2.6, 3.6 and 4.6hPa of water vapor and environmental scanning electron microscope. Thermogravimetric experiments allowed the determination of induction periods. Distributions of the...

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Bibliographic Details
Published in:Thermochimica acta 2011-07, Vol.521 (1-2), p.155-160
Main Authors: Favergeon, Loïc, Pijolat, Michèle
Format: Article
Language:English
Subjects:
Chemistry
crystals
Exact sciences and technology
Inorganic chemistry and origins of life
Preparations and properties
Salts
scanning electron microscopes
thermogravimetry
vapor pressure
water vapor
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Summary:The dehydration of Li₂SO₄·H₂O single crystals at 80°C has been studied by means of both isothermal thermogravimetry at 2.6, 3.6 and 4.6hPa of water vapor and environmental scanning electron microscope. Thermogravimetric experiments allowed the determination of induction periods. Distributions of these isoconversion induction periods for a large number of single crystals showed that increasing the water vapor pressure produced a longer induction period. Moreover, the shape of the distributions of the induction periods over a large number of single crystals changed from one mode at 2.6hPa to two modes at 3.6 and 4.6hPa. Using an environmental scanning electron microscope, this result could be attributed to differences in nucleation rates at edges and faces of the single crystals.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2011.04.018