Origin of the thermal desorption peaks of gases in NaI above 180°C

We analyze the origin of the water desorption peaks in NaI above the temperature stability range of the crystalline hydrate NaI · 2H 2 O. The two water desorption peaks at t ≥ 180°C are shown to arise from the decomposition of aqua complexes based on hydroxyl groups. Such peaks in the pressure-tempe...

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Published inInorganic materials Vol. 45; no. 11; pp. 1314 - 1318
Main Authors Sofronov, D. S., Kudin, K. A., Voloshko, A. Yu, Kudin, A. M., Shishkin, O. V.
Format Journal Article
LanguageEnglish
Published Dordrecht SP MAIK Nauka/Interperiodica 01.11.2009
Subjects
Chemistry
Chemistry and Materials Science
Crystal structure
Dehydration
Desorption
Drying
Hydrates
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Materials Science
Microwaves
Origins
Raw materials
Sodium Iodide
Salt Particle
Desorption Peak
Aqua Complex
Water Complex
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Summary:We analyze the origin of the water desorption peaks in NaI above the temperature stability range of the crystalline hydrate NaI · 2H 2 O. The two water desorption peaks at t ≥ 180°C are shown to arise from the decomposition of aqua complexes based on hydroxyl groups. Such peaks in the pressure-temperature curve provide an effective and sensitive tool for detecting OH groups in raw materials. After prolonged room-temperature dehydration, no such peaks emerge. The dehydration process can be accelerated by microwave drying.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0020-1685
1608-3172
DOI:10.1134/S0020168509110235