Thermochemical Properties Over LiCl-KCl-UCl3 Ternary Salt System: Knudsen Effusion Mass Spectrometric Study

• Published in: Journal of phase equilibria and diffusion Vol. 44; no. 3; pp. 496 - 508
• Main Authors: Trinadh, V. Venkata, Manikandan, P., Bera, Suranjan, Brahmananda Rao, C. V. S., Lakshmi Narasimhan, T. S.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.06.2023; Springer Nature B.V
• Subjects: Ceramics; Chemical equilibrium; Composites; Crystallography and Scattering Methods; Engineering Thermodynamics; Enthalpy; Equilibrium; External pressure; Glass; Heat and Mass Transfer; Knudsen effusion; Lithium chloride; Mass spectrometry; Metallic Materials; Natural Materials; Original Research Article; Partial pressure; Physics; Physics and Astronomy; Potassium chloride; Pressure dependence; Thermochemical properties; Thermodynamics; Vapor phases; Vaporization; LiCl-KCl-UCl; (cr) ternary salt system; enthalpy; pressure–temperature relation; Knudsen effusion mass spectrometry
• ISSN: 1547-7037; 1863-7345; 1934-7243
• DOI: 10.1007/s11669-023-01053-z

Vaporisation studies were carried out over the solid region of LiCl(cr), KCl(cr) and liquid region of LiCl-KCl-UCl 3 ternary salt system by using Knudsen Effusion Mass Spectrometry (KEMS) in the temperature range of 715–913 K. Monomeric and dimeric species were observed in the vapour phase in equilibrium with their respective salts, LiCl(cr) and KCl(cr). LiCl(g), Li 2 Cl 2 (g), KCl(g), K 2 Cl 2 (g), and UCl 3 (g) were the neutral species observed in the equilibrium vapour over ternary salt. Partial pressure–temperature relations for vapour species were derived using in-situ calibration from pressure dependent equilibrium constants as well as using pure silver as external calibrant. Using p-T relations, various heterogeneous reaction equilibria that exist between condensed phase-gas phase and the dissociation equilibra of following gas phase reactions: Li 2 Cl 2 (g) = 2LiCl(g); K 2 Cl 2 (g) = 2KCl(g) were evaluated by using 2nd and 3rd law methods. Also, the enthalpies of pressure-independent reactions: LiCl(cr) + LiCl(g) = Li 2 Cl 2 (g); KCl(cr) + KCl(g) = K 2 Cl 2 (g) were evaluated by using 3rd law method. Knudsen effusion mass spectrometric studies on LiCl-KCl-UCl 3 ternary salt system were carried out for the first time.