A Physical Property Summary for ANP Fluoride Mixtures

Cohen, S. I.; Powers, W.D.; Greene, N.D.

doi:10.2172/12773302

Cited by 4 publications

(2 citation statements)

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“…The model is seen to well-reproduce solubilities within the limits proposed by Short and Roy 46 (Figure 3c) with a eutectic at x NaF = 39.5 mol % and 922.5 K. The model-computed ΔC p of 2.10 J mol −1 K −1 at 1321 K (average temperature of the Δ mix H measurements) for an equimolar composition agrees very well with the interpolated values of Benešet al 42 and of Filatov. 18 Additionally, the calculated ΔH fus for a 60LiF−40NaF molar mixture of 25,010 J mol −1 approaches the values of Cohen et al 41 (23,020 J mol −1 ), Radionova et al 45 (26,700 J mol −1 ), Phillips and Stears 44 (26,400 J mol −1 ), and Eichelberger 43 (25,980 J mol −1 ). This agreement is particularly striking in that these observed ΔH fus values were not used in the system optimization, with the models returning similar quantities, providing confidence in the thermodynamic representation.…”

Section: Phase Equilibria Determinationssupporting

confidence: 62%

“…38,39 A value of ΔC p = 2.4 J mol −1 K −1 was derived from Δ mix H for an equimolar mixture (Figure 3b) via eq 3, the value for which is in good agreement with that of other determinations. 17,18,41,42 The relation for the optimized Gibbs energy contribution of the LiNa/F interaction in the liquid phase includes a T ln(T) term to allow the simultaneous optimization of Δ mix H and ΔC p (these require computing second derivatives), and they thus yield…”

Section: Phase Equilibria Determinationsmentioning

confidence: 99%

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Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Schorne-Pinto,

Aziziha,

Tisdale

et al. 2024

ACS Appl. Energy Mater.

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The thermodynamic properties of the LiF−NaF−KF system and its subsystems were re-evaluated using the CALPHAD method, focusing on the deviations from ideality in the heat capacity [C p (T)] of mixtures, temperature-dependence of mixing enthalpies (Δ mix H), vapor pressures of mixtures, and enthalpies of fusion (ΔH fus ) using reported values and measurements. The results of this work confirmed a pseudoternary eutectic at 732.9 K and 46.5LiF− 11.5NaF−42KF mol % (FLiNaK) with determined C p (T) = 69.822 + 0.000679T + 2,137,152T −2 J mol −1 K −1 (732.9 < T < 1200 K) and ΔH fus = 18,051 J mol −1 in good agreement to the experimental values. The resulting accurate thermodynamic representation can be used to find relevant excess thermochemical properties in the whole pseudoternary space and provide insights into their composition and temperature dependence. A detailed evaluation of select thermophysical properties was also conducted to determine recommended density, thermal diffusivity, thermal conductivity, vapor pressures, and boiling point with calculated uncertainties over the temperature range of interest for FLiNaK−salt energy applications.

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Section: Phase Equilibria Determinationssupporting

confidence: 62%

Section: Phase Equilibria Determinationsmentioning

confidence: 99%

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Schorne-Pinto,

Aziziha,

Tisdale

et al. 2024

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

Bibliography

Chaney¹,

Ramdas²,

Rodríguez³

et al. 1982

Thermophysical Properties Research Literature Retrieval Guide 1900–1980

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Density Measurements of Molten Salts

2023

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The present study focused on the development of a method to measure the density of molten salt. The method was validated by measuring densities of molten LiF−ThF 4 and LiF−ThF 4 −UF 4 salts and comparing them with ideal-mixture calculations and reference data. For LiF−ThF 4 , densities obtained in this study showed deviations less than 3% from the previously reported densities and the calculated values obtained using the ideal-mixture formula. For LiF−ThF 4 −UF 4 , deviations from idealmixture calculations were within 3%. Densities of a molten NaF−KF−UF 4 and a molten NaF−BeF 2 −UF 4 −ZrF 4 were also measured from 813 to 1173 and 838 to 1073 K, respectively. The measured values of these salts showed less than 2% deviations from the ideal-mixture values. In addition, the measured densities of the NaF−KF−UF 4 and NaF−BeF 2 −UF 4 −ZrF 4 salts showed similar trends to the density-temperature correlations of NaF−KF−UF 4 and NaF−BeF 2 −UF 4 salts, respectively, with similar compositions reported by previous studies.

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A Physical Property Summary for ANP Fluoride Mixtures

Cited by 4 publications

References 0 publications

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Thermal Property Modeling and Assessment of the Physical Properties of FLiNaK

Bibliography

Density Measurements of Molten Salts

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