Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 4: Issue 4
Apport de l'analyse thermique differentielle quantitative a l'etude du polymorphisme du nitrate de potassium a la pression atmospherique
Author:
M. Harmelin Laboratoire de Recherches Microanalytiques du C. N. R. S. Paris France

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Pages:
403–415
Online Publication Date:
23 Jul 2005
Publication Date:
01 Dec 1972
Article Category:
Research Article
DOI:
https://doi.org/10.1007/bf01913799
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The changes in the structure of potassium nitrate have been studied by differential thermal analysis. The samples were heated and cooled in a stream of dry nitrogen, at atmospheric pressure. On cooling, the following transformations have been observed: I → III→ II. The exothermic peak corresponding to the I → III transformation appeared at 118–120° with good reproducibility. Surface area measurements show the complete reversibility already observed by Mazières for the I → III transformation. The III → I and the II → I processes take place at the same temperature (127–130°), but the peak corresponding to the III → I change is of lower intensity, representing only 51.5% of that of the peak belonging to the II → I transition. If the enthalpy change belonging to process II → I,ΔH=13.2 cal/g, that belonging to transition III → I,ΔH=6.8±0.2 cal/g. Transformation III → II proceeds in two steps and is greatly influenced by the preceding heat treatment of phase I.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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