Excess heat capacity of the (Li1−xCax)F1+x liquid solution determined by differential scanning calorimetry and drop calorimetry. (February 2015)

• Record Type: Journal Article
• Authors: Capelli, E.; Beneš, O.; Konings, R.J.M.
• Is Part Of: Journal of chemical thermodynamics. Volume 81(2015:Feb.)
• Page Start: 160
• Page End: 166
• Publication Date: 2015-02
• Subjects: Molten salt -- Heat capacity -- Differential Scanning Calorimeter -- Drop calorimeter; Thermodynamics -- Periodicals; Thermochemistry -- Periodicals; Thermodynamique -- Périodiques; Thermochimie -- Périodiques; Thermochemistry; Thermodynamics; Periodicals; 541.369
• DOI: 10.1016/j.jct.2014.10.007
• Languages: English
• ISSNs: 0021-9614

Abstract

Highlights: The heat capacity of the (Li1− x Ca x )F1+ x liquid solution was measured. A procedure for DSC was developed to measure heat capacity of encapsulated samples. A significant excess heat capacity of (Li1− x Ca x )F1+ x liquid solution was observed. Abstract: The work presents the measured heat capacity of the (Li1− x Ca x )F1+ x liquid solution. Four samples with different compositions have been prepared and measured using a Differential Scanning Calorimeter. Since this technique was newly adopted for measuring encapsulated fluoride samples, some modifications were introduced in the standard configuration of the instrument and they are described in this work as well. For comparison one of the analysed composition ( x CaF 2 = 0.5) was also measured using drop calorimetry, which has been previously used for similar studies. The reliability of the results obtained was confirmed by the good agreement between the two techniques. Moreover, the excess heat capacity of the (Li1− x Ca x )F1+ x liquid solution was derived and a strong deviation from the ideal behaviour was observed.