Critical examination and experimental determination of melting enthalpies and entropies of salt hydrates

Guion, J.; Sauzade, J.D.; Laügt, M.

doi:10.1016/0040-6031(83)80096-3

Cited by 64 publications

(37 citation statements)

References 4 publications

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“…Magnesium nitrate hexahydrate shows solid-solid phase transition at around 72 °C with enthalpy change of ∆ trs H = 3.1 kJ mol -1 [12,13], and melts at about 90 °C with enthalpy of fusion varied from 38.5 to 42.8 kJ mol -1 [1,3,5,6,8,[12][13][14][15][16]. All data available in literature are summarized with our results (described later).…”

Section: Introductionmentioning

confidence: 91%

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Calorimetric study of calcium nitrate tetrahydrate and magnesium nitrate hexahydrate

Sádovská

Honcová

Pilař

et al. 2015

J Therm Anal Calorim

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The heat capacity and enthalpy of fusion of calcium nitrate tetrahydrate, and magnesium nitrate hexahydrate were determined from 234.15 K to melting temperature with point of view of energy storage. 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 is 43.9 ± 0.3 °C and 36.6 ± 0.2 kJ mol One solid-solid phase transformation was observed for the magnesium salt at 72.5 ± 0.9 °C with enthalpy of transition 3.1 ± 0.2 kJ mol -1 . The accumulated energy composed of sensible and latent heat 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.

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Section: Introductionmentioning

confidence: 91%

“…The temperature of CNT melting is published in the range from 42 to 47 °C with enthalpy of fusion having value from 28.7 to 36.1 kJ mol -1 [1,[3][4][5][6][7][8][9]. Published values of heat capacity are often determined by one author for short temperature range [4,7,10,11].…”

Section: Introductionmentioning

confidence: 99%

Calorimetric study of calcium nitrate tetrahydrate and magnesium nitrate hexahydrate

Sádovská

Honcová

Pilař

et al. 2015

J Therm Anal Calorim

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“…It is also easier to be stabilised and it shows small segregation [70]. Furthermore, the volume storage density (about 267 MJ m À3 with CaCl 2 $6H 2 O, Table 1) and thermal conductivity (1 W m À1 C À1 , [70]) are high though they are low compared to other salt hydrates [56,70]. The melting temperature of CaCl 2 $6H 2 O (z29 C) happens to be in the range of thermal comfort applications though this melting temperature is relatively high [72].…”

Section: The Interest In Cacl 2 For Pcm Applicationsmentioning

confidence: 99%

A review on the use of calcium chloride in applied thermal engineering

N’Tsoukpoe¹,

Rammelberg²,

Fopah-Lele³

et al. 2015

Applied Thermal Engineering

106

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“…The AH~ values of the normal and deuterated crystal hydrates, necessary for the AHp,.tr. calculations were determined from the Rozenfeld-Karapetianz equation [10][11][12], using the initial value of AH}~otom2 = -946.42 kJ/mol.…”

Section: Resultsmentioning

confidence: 99%

Thermal and calorimetric investigations on crystalline hydrates of barium hydroxide and their deuterated analogues

Maneva-Petrova

Nikolova

1986

Journal of Thermal Analysis

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The thermal decompositions of Ba(OH)2.8H20, Ba(OH)z.8D20, Ba(OH)2.H20 and Ba(OH)2. D20 were studied and the phase transitions were identified by DSC and DTA methods. The corresponding enthalpy changes were determined and compared with those calculated from the thermodynamic data. A decrease of the thermal stability was demonstrated for the deuterated crystal hydrates in comparison with the normal ones.The utilization of phase transitions in crystal hydrates as a kind of heat-energy storage explains the particular recent interest in this type of compounds. Specially, barium hydroxide and its crystal hydrates are of great interest both for the abovementioned purpose and for electronics applications.The thermal behaviour of Ba(OH) 2-8H20 has been studied by differential thermal analysis (DTA) [1][2][3][4][5], but the data obtained for the lower crystal hydrates and for the transition temperatures were contradictory. There are no corresponding data on Ba(OH)2-nD20.The object of the present work was to examine the thermal dissociations of Ba(OH)2.8H20 , Ba(OH)z. H20 , Ba(OH)2.8D20 and Ba(OH) z'D20 by two different methods, DTA and differential scanning calorimetry (DSC), in order to enrich the information available on the thermal behaviours of the above compounds and on the differences between normal and deuterated analogues, as well as to determine the enthalpy changes in the most important phase transitions.

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Critical examination and experimental determination of melting enthalpies and entropies of salt hydrates

Cited by 64 publications

References 4 publications

Calorimetric study of calcium nitrate tetrahydrate and magnesium nitrate hexahydrate

Calorimetric study of calcium nitrate tetrahydrate and magnesium nitrate hexahydrate

A review on the use of calcium chloride in applied thermal engineering

Thermal and calorimetric investigations on crystalline hydrates of barium hydroxide and their deuterated analogues

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