Melting-crystallization and premelting properties of sodium nitrate-potassium nitrate. Enthalpies and heat capacities

Rogers, Derek J.; Janz, George J.

doi:10.1021/je00030a017

Cited by 81 publications

(38 citation statements)

References 5 publications

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“…The maximum deviation from all measurements was ±4 % of these average values. For temperature ranges from 80 • C to 190 • C and from 350 • C to 380 • C, our measurements agree to within ±3 % with literature values from Rogers and Janz [30], Takahashi et al [34], Carling [35], and Jriri et al [6]. The heat capacity in the liquid range is approximately constant.…”

Section: Heat Capacitysupporting

confidence: 89%

“…Heat capacity data of NaNO 3 are available from various authors [21,[30][31][32][33][34][35] and have been reviewed by Jriri et al [6] (Fig. 5).…”

Section: Heat Capacitymentioning

confidence: 99%

“…First, NaNO 3 in the liquid state strongly wets common container materials. As a result, the salt creeps out of the container [9,30]. Second, there is nitrite formation in the melt, so that measurements refer to the binary NaNO 2 -NaNO 3 system, rather than the single NaNO 3 salt.…”

Section: Heat Capacitymentioning

confidence: 99%

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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: Heat Capacitysupporting

confidence: 89%

“…Heat capacity data of NaNO 3 are available from various authors [21,[30][31][32][33][34][35] and have been reviewed by Jriri et al [6] (Fig. 5).…”

Section: Heat Capacitymentioning

confidence: 99%

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Characterization of Sodium Nitrate as Phase Change Material

2011

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“…The heat of mixing, heat of fusion, and heat capacity for various nitrate and nitrite salts has been extensively reported [18,28,[32][33][34][35][36][37][38]. The precision of data is depen dent on the experimental method.…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

“…Heat of melting/fusion varies greatly depending on the cation. For example, ΔH fus = 25.0 kJ/mol for LiNO 3 but 9.9 kJ/mol for KNO 3 [34,39]. It should be noted that nonideal mixing is observed, which limits the ability to predict the heat of mixing/ fusion based on the mole percent of each individual con stituent [40].…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

Chemical Perspectives on Alkali and Earth Alkaline Nitrate and Nitrite Salts for Concentrated Solar Power Applications

Cordaro¹

2013

Green

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Molten salts have been widely considered as the leading candidate heat transfer fluids (HTF) used in high temperature, concentrated solar power plants. Specifi cally, nitrate and nitrite based salts have been investigated as a HTF and even deployed in pilot plants generating up to 19.9 MW of electricity at operating temperatures above 500 °C. New plant designs requiring higher operating tem peratures for better efficiencies are pushing the stability limit of HTF. This paper presents an overview of the ther mophysical properties of nitrate and nitrite salts and dis cusses thermodynamic and kinetic stability limitations as they relate to concentrated solar power generation.

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Raman spectroscopic studies of mixed crystals of NaNO3-KNO3 quenched from different temperatures: evidence for limited solid solutions in the system

Yang

1999

J. Raman Spectrosc.

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Raman spectroscopy was used as a complementary tool to thermal and x-ray methods in phase equilibrium studies of the NaNO 3 -KNO 3 system. Based on the microscopic structures of the system, the Raman technique confirned the phase diagrams obtained by thermal studies. Structural phase transitions of the R3m solid solutions to limited solid solutions were detected and the solid solubilities of the limited solid solutions were determined. The continuous series of solid solutions was found to consist of three slightly different structures and hence NaNO 3 -KNO 3 should be a system with limited solid solutions, which appeared to fit better than the continuous solid solution model to the reported experimental observations in Raman, differential scanning calorimetric and x-ray diffraction studies.

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Melting-crystallization and premelting properties of sodium nitrate-potassium nitrate. Enthalpies and heat capacities

Cited by 81 publications

References 5 publications

Characterization of Sodium Nitrate as Phase Change Material

Characterization of Sodium Nitrate as Phase Change Material

Chemical Perspectives on Alkali and Earth Alkaline Nitrate and Nitrite Salts for Concentrated Solar Power Applications

Raman spectroscopic studies of mixed crystals of NaNO3-KNO3 quenched from different temperatures: evidence for limited solid solutions in the system

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