Experimental determination of the volume change of pure salts and salt mixtures at their melting point

Petitet, J. P.; Fraiha, M.; Tufeu, R.; Neindre, B. Le

doi:10.1007/bf00503636

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…5). Petitet et al [23] reviewed data about the volume change on melting V related to the volume in the solid state at the melting temperature at atmospheric pressure V s and reported the following V /V s values in percent: 8.3, 9.6, 9.7, 10.0, and 10.7. In this work a value of 9.7 % from Schinke and Sauerwald [24] was assumed (Fig.…”

Section: Density and Thermal Expansionmentioning

confidence: 97%

Characterization of Sodium Nitrate as Phase Change Material

2011

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In this article the results of material investigations of sodium nitrate (NaNO 3 ) with a melting temperature of 306 • C as a phase change material (PCM) are presented. The thermal stability was examined by kinetic experiments and longduration oven tests. In these experiments the nitrite formation was monitored. Although some nitrite formation in the melt was detected, results show that the thermal stability of NaNO 3 is sufficient for PCM applications. Various measurements of thermophysical properties of NaNO 3 are reported. These properties include the thermal diffusivity by the laser-flash, the thermal conductivity by the transient hot wire, and the heat capacity by the differential scanning calorimeter method. The current measurements and literature values are compared. In this article comprehensive temperature-dependent thermophysical values of the density, heat capacity, thermal diffusivity, and thermal conductivity in the liquid and solid phases are reported.

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Section: Density and Thermal Expansionmentioning

confidence: 97%

Characterization of Sodium Nitrate as Phase Change Material

2011

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“…Eight binary mixtures of sodium nitrite and sodium nitrate of composition from 0.25 ( 0.01 to 0.80 ( 0.01 in X(NaNO 3 ) in our experiments showed three endothermic events in the heating curves (see, e.g., Figure 2C) with the maximum temperature of the lowest one averaging (159 ( 1) °C over the whole of this range (see Figure 3), although with decreasing enthalpy toward the mixtures richer in nitrate (see Figure 4A, in which the size of the enthalpy change at each composition is plotted), thus suggesting that the transition would be undetect- 16 13.98 11,12 14.6 14 15.3 16 15.34 ( 0.18 17 a Possibly the sum of the solid-state transformation and the melting. able above X(NaNO 3 ) ) about 0.85 and that it derived from the nitrite component.…”

Section: Resultsmentioning

confidence: 97%

NaNO₂ + NaNO₃ Phase Diagram: New Data from DSC and Raman Spectroscopy

2005

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The binary phase diagram of sodium nitrite and sodium nitrate is currently not well-understood because four earlier determinations of this binary system resulted in considerably different conclusions. Two works classify the system as eutectic and two as a continuous solid solution type, together with different sub-solidus curves. New Raman measurements and differential scanning calorimetry data on solidified mixtures of different compositions have provided support for a simple eutectic diagram with a solidus at 230 °C ranging from 0.25 to 0.80 in mole fraction of sodium nitrate. A sub-solidus transition was detected close to 183 °C and a second one close to 160 °C. The latter was considered to be related to the nitrite component and probably arose from the ferroelectric to antiferroelectric or paraelectric transition of sodium nitrite. The change of slope of the maxima of some Raman lines with temperature also gave support to these transitions.

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“…Chemically pure (melted and crystallized under vacuum) [192] ---581 ------VD Reagent grade (dried by heating at temperature just above its melting point under either an inert gas atmosphere or a vacuum) [76] ---580 ------SDT/MS Ultrapure (dried in air and the in vacuum at 330 K for 3 hours) [193] -…”

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confidence: 99%