NDLI: Calorimetric study of calcium nitrate tetrahydrate and magnesium nitrate hexahydrate

Content Provider	Springer Nature Link
Author	Sádovská, Galina Honcová, Pavla Pilař, Radim Oravová, Lucie Honc, Daniel
Copyright Year	2015
Abstract	The heat capacity and enthalpy of fusion of calcium nitrate tetrahydrate and magnesium nitrate hexahydrate were determined from 234.15 K to melting temperature by DSC. The modified stepwise method was used for heat capacity measurement, and enthalpy of fusion was determined from continuous heating by the rate of 10 K min$^{−1}$ (Pilař et al. in J Therm Anal Calorim 118:485–491, 2014). Determined values were used for the calculation of entropy and Gibbs energy in the experimental temperature range. Melting point and enthalpy of fusion of calcium nitrate tetrahydrate are 317.1 ± 0.3 K and 36.6 ± 0.2 kJ mol$^{−1}$, and for the magnesium nitrate hexahydrate, the values are 362.9 ± 0.4 K and 40.8 ± 0.5 kJ mol$^{−1}$. One solid–solid phase transformation was observed for the magnesium salt at 345.7 ± 0.9 K with enthalpy of transition 3.1 ± 0.2 kJ mol$^{−1}$. The available accumulated energy composed of sensible (heating) and latent heat (phase transformations) is 43.4 and 63.8 kJ mol$^{−1}$ for the hydrated calcium and magnesium nitrate, respectively. The kinetics of solid–solid phase transformation for magnesium salt was studied under non-isothermal conditions by DSC, and the process was described using autocatalytical model with parameters in the range of 0.50–0.85 for m and range of 2.58–1.48 for n, respectively.
Starting Page	539
Ending Page	546
Page Count	8
File Format	PDF
ISSN	13886150
Journal	Journal of thermal analysis
Volume Number	124
Issue Number	1
e-ISSN	15882926
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-11-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Calcium nitrate tetrahydrate Magnesium nitrate hexahydrate Heat capacity Phase change materials Kinetics Autocatalytical model Physical Chemistry Analytical Chemistry Polymer Sciences Inorganic Chemistry Measurement Science and Instrumentation
Content Type	Text
Resource Type	Article
Subject	Physical and Theoretical Chemistry Condensed Matter Physics

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