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Investigation on the thermal behaviour of Mg(NO3)2·6H2O

II Results in a closed system: Melting and solidification behaviour

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Abstract

DTA, DSC and X-ray investigations of Mg(NO3)2 · 6H2O revealed a lattice transformation at (71±2) ‡C withδH=12.5 J/g, and congruent melting at 90 ‡C withδH=150.3 J/g. The results of the DTA investigations on different Mg(NO3)2-H2O samples are in good agreement with those of solubility investigations. The melting enthalpy of Mg(NO3)3 · 6H2O is lowered considerably by deviation from the stoichiometric water content of the compound. The results allow conclusions as to the application of this salt hydrate as a latent heat-storage material.

Zusammenfassung

DTA-, DSC- und röntgenographische Untersuchungen von Mg(NO3)2 · 6H2O zeigten die Existenz einer Gitterumwandlung bei (71±2) ‡C mitδH=12.5 J/g und ein kongruentes Schmelzen bei 90 ‡C mitδH=150.3 J/g. Die Ergebnisse der DTA-Untersuchungen an verschiedenen Mg(NO3)2-H2O Proben stehen in guter übereinstimmung mit denen von Löslichkeitsuntersuchungen. Durch ein Abweichen vom stöchiometrischen Wassergehalt der Verbindung wird die Schmelzenthalpie von Mg(NO3)2 · 6H2O beträchtlich vermindert. Die Ergebnisse ermöglichen Aussagen zur Anwendbarkeit dieses Salzhydrates als Wärmespeichermedium.

РЕжУМЕ

ДтА, Дск И РЕНтгЕНОстР УктУРНыЕ ИсслЕДОВАН Иь гЕксАгИДРАтА НИтРАт А МАгНИь пОкАжАлИ пРЕВРАЩЕНИ Е ЕгО РЕшЕткИ пРИ 71±2‡ сδH=12,5 Дж ·\(\hat \Gamma ^1 \) И ЕгО кОНгРУЁНтНОЕ п лАВлЕНИЕ пРИ 90‡ сδH=150,3 Дж·г−1. РЕжУ льтАты ДтА ИсслЕДОВА НИИ с РАжлИЧНыМИ ОБРАжцАМ И Mg(NO3)2-H2O хОРОшО сОглАсУУт сь с РЕжУльтАтАМИ пО И х РАстВОРИМОстИ. ЁНтАл ьпИь плАВлЕНИь гЕксАгИДР АтА НИтРАтА МАгНИь жН АЧИтЕльНО пОНИжАЕтсь пРИ ОтклО НЕНИИ сОДЕРжАНИь ВОДы От стЕхИОМЕтРИЧ ЕскОгО. РЕжУльтАты пР ОВЕДЕННых ИсслЕДОВАНИИ пОжВОл ИлИ сДЕлАть жАклУЧЕНИЕ О пОтЕНцИ АльНОМ пРИМЕНЕНИИ Ёт ОИ сОлИ В кАЧЕстВЕ тЕплОВОгО А ккУМУльтОРА.

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Authors and Affiliations

  1. Sektion Chemie, Bergakademie Freiberg, 9200, Freiberg, G.D.R.

    R. Naumann, H. -H. Emons, K. Köhnke, J. Paulik & F. Paulik

  2. Institute of General and Analytical Chemistry, Technical University, Budapest, Hungary

    J. Paulik & F. Paulik

Authors
  1. R. Naumann
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  2. H. -H. Emons
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  3. K. Köhnke
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  4. J. Paulik
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  5. F. Paulik
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Additional information

We thank Dr. Flammersheim, Department of Chemistry, FSU, Jena, for the DSC measueements.

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Naumann, R., Emons, H.H., Köhnke, K. et al. Investigation on the thermal behaviour of Mg(NO3)2·6H2O. Journal of Thermal Analysis 34, 1327–1333 (1988). https://doi.org/10.1007/BF01914357

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  • DOI: https://doi.org/10.1007/BF01914357

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