The high-temperature heat capacity of the (Li,Na)F liquid solution

Beneš, O.; Konings, R.J.M.; Kuenzel, Carsten; Sierig, Mark; Dockendorf, A.; Vlahovic, L.

doi:10.1016/j.jct.2009.02.009

Cited by 17 publications

(19 citation statements)

References 7 publications

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“…Therefore, in this work, we investigate the heat capacity of liquid mixtures of KF, RbF, and CsF with LiF. The results were compared with those of the LiF−NaF mixture, which were previously published by Benešet al; 4 this information allows us to establish a clear tendency that the heat capacity increases with increasing differences of the cation radii of the salt present in the melt.…”

Section: ■ Introductionmentioning

confidence: 85%

Excess Heat Capacity in Liquid Binary Alkali-Fluoride Mixtures

et al. 2013

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Using drop calorimetry, we measured enthalpy increments of the LiF-KF, LiF-RbF, and LiF-CsF binary systems at temperatures above the melting point. Ten samples with different compositions (four compositions for LiF-KF, one composition for LiF-RbF, and five compositions for LiF-CsF) were prepared and measured between 884 K and 1382 K. To protect the calorimeter from corrosive fluoride vapor at high temperature, an encapsulating technique developed for this purpose was used. The samples were filled in nickel containers that were sealed by laser welding and afterward used for the measurements. From the obtained results, we derived the molar heat capacity functions of the respective samples. The heat capacities of the samples, having different compositions of the same binary system, were compared with the values for ideal behavior and the excess heat capacity function was determined for the entire composition range of the liquid solution. It was found that the excess heat capacities clearly depend on the cation radius and increase in the following order: LiF-NaF < LiF-KF < LiF-RbF < LiF-CsF.

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Section: ■ Introductionmentioning

confidence: 85%

Excess Heat Capacity in Liquid Binary Alkali-Fluoride Mixtures

et al. 2013

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“…For heat capacity measurements, ThF 4 was encapsulated in nickel (for chemical compatibility 20 ) capsules, which consist of two parts (a container and a lid) sealed together by an in-house laser welding technique described in our previous work. 21 After insertion of ThF 4 into the container, the lid is pressed manually at the top and then welded with a laser. The quality of the welding is first checked visually by microscopy and then tested by heating up to 1523 K for 4 h in an argon atmosphere, monitoring any weight loss.…”

Section: Methodsmentioning

confidence: 99%

“…For heat capacity measurements, ThF 4 was encapsulated in nickel (for chemical compatibility) capsules, which consist of two parts (a container and a lid) sealed together by an in-house laser welding technique described in our previous work . After insertion of ThF 4 into the container, the lid is pressed manually at the top and then welded with a laser.…”

Section: Methodsmentioning

confidence: 99%

Isobaric Heat Capacity of Solid and Liquid Thorium Tetrafluoride

et al. 2019

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The isobaric heat capacity of solid and liquid thorium tetrafluoride was determined by two calorimetry methods: drop calorimetry to obtain the enthalpy increments in the range from 430 to 1600 K and DSC to obtain the hightemperature heat capacity of solid and liquid thorium tetrafluoride using the step method. Adjustments to the experimental setups were developed and implemented to increase accuracy and reduce uncertainty of the obtained data.

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“…One of the samples (composition x CaF 2 = 0.64) was subjected to a quenching procedure in order to determine the ratio between the stable phases at high temperature. The powder was compressed into a pellet, encapsulated inside a nickel crucible, 14 and heated to 1273 K in a furnace under argon flow. After the temperature stabilization, the sample was dropped into liquid nitrogen and analyzed with the XRD technique.…”

Section: ■ Experimentsmentioning

confidence: 99%

Thermodynamic Investigation of the CaF₂–ThF₄ and the LiF–CaF₂–ThF₄ Systems

et al. 2015

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In this study we present the thermodynamic description of the binary CaF2–ThF4 system and the ternary LiF–CaF2–ThF4 system. In order to describe the general shape of the phase diagram, the phase equilibria of several intermediate compositions of the CaF2–ThF4 system have been measured for the first time in the present work using the DSC technique. These results have been combined with X-ray diffraction studies for the identification of the phases in equilibrium and for the determination of the structure of the CaThF6 compound. Considering all of the novel experimental data, the CaF2–ThF4 system has been assessed for the first time using the Calphad approach. Moreover, the ternary LiF–CaF2–ThF4 phase diagram has been calculated and optimized using the experimental data obtained in this study for the ternary mixtures. The model developed reproduces very well all the measurements performed and correctly predicts the lowest eutectic temperature and composition.

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The high-temperature heat capacity of the (Li,Na)F liquid solution

Cited by 17 publications

References 7 publications

Excess Heat Capacity in Liquid Binary Alkali-Fluoride Mixtures

Excess Heat Capacity in Liquid Binary Alkali-Fluoride Mixtures

Isobaric Heat Capacity of Solid and Liquid Thorium Tetrafluoride

Thermodynamic Investigation of the CaF₂–ThF₄ and the LiF–CaF₂–ThF₄ Systems

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The high-temperature heat capacity of the (Li,Na)F liquid solution

Cited by 17 publications

References 7 publications

Excess Heat Capacity in Liquid Binary Alkali-Fluoride Mixtures

Excess Heat Capacity in Liquid Binary Alkali-Fluoride Mixtures

Isobaric Heat Capacity of Solid and Liquid Thorium Tetrafluoride

Thermodynamic Investigation of the CaF2–ThF4 and the LiF–CaF2–ThF4 Systems

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Thermodynamic Investigation of the CaF₂–ThF₄ and the LiF–CaF₂–ThF₄ Systems