Thermal behaviour of [Ca(H2O)4](NO3)2

Anna Migdał-Mikuli; Joanna Hetmańczyk; Ł. Hetmańczyk

doi:10.1007/s10973-006-7526-1

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Journal of Thermal Analysis and Calorimetry

Volume/Issue:: Volume 89: Issue 2

Thermal behaviour of [Ca(H₂O)₄](NO₃)₂

Authors:

Anna Migdał-Mikuli

Anna Migdał-Mikuli Jagiellonian University Department of Chemical Physics, Faculty of Chemistry ul. Ingardena 3 30-060 Cracow Poland

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Joanna Hetmańczyk

Joanna Hetmańczyk Jagiellonian University Department of Chemical Physics, Faculty of Chemistry ul. Ingardena 3 30-060 Cracow Poland

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, and

Ł. Hetmańczyk

Ł. Hetmańczyk Jagiellonian University Department of Chemical Physics, Faculty of Chemistry ul. Ingardena 3 30-060 Cracow Poland

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Pages:: 499–503

Online Publication Date:: 20 Oct 2006

Publication Date:: 01 Aug 2007

Article Category:: Research Article

DOI:: https://doi.org/10.1007/s10973-006-7526-1

Keywords:: anhydrous calcium nitrate(V); DSC; DTA; melting points; tetraaquacalcium nitrate(V); TG; thermal decomposition

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Abstract

Melting process and thermal decomposition of [Ca(H₂O)₄](NO₃)₂ was studied by thermogravimetry analysis (TG), differential scanning calorimetry (DSC) and simultaneous differential thermal analysis (SDTA) at a constant heating rate. The gaseous products of the decomposition were on-line identified by a quadruple mass spectrometry (QMS). Tetraaquacalcium nitrate(V) melts at T_m=320 K. The decomposition of the sample proceeds in three main stages. In the first stage dehydration of [Ca(H₂O)₄](NO₃)₂ to anhydrous Ca(NO₃)₂ undergoes in two steps, in which consecutively 1/4 and 3/4 of all H₂O molecules are liberated. The thermal dehydration process starts just above ca. 302 K and continues up to ca. 475 K. In the second stage (475–775 K) anhydrous Ca(NO₃)₂ remains unchanged. The third stage is connected with the melting of anhydrous Ca(NO₃)₂ at T_m=816 K and next with its decomposition in the liquid phase to nitrogen oxide, oxygen, nitrogen and solid CaO.

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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)