The sublimation of argon, krypton, and xenon

• Published in: The Journal of chemical thermodynamics Vol. 40; no. 12; pp. 1621 - 1626
• Main Authors: Ferreira, A.G.M., Lobo, L.Q.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.12.2008; Elsevier
• Subjects: Chemical thermodynamics; Chemistry; Elements, mineral and organic compounds; Enthalpy: Clapeyron equation; Exact sciences and technology; General and physical chemistry; Pressure; Rare gases: Ar, Kr, Xe, (Ne, Rn); Sublimation; Thermodynamic properties; Enthalpy: Clapeyron equation; Pressure; Sublimation; Rare gases: Ar, Kr, Xe, (Ne, Rn); Kr. Xe; Rare gases: Ar; Heat of sublimation; Rn); Sublimation; Pressure; Enthalpy: Clapeyron equation; Xenon; Ne; Noble gas; Argon; Krypton; Thermodynamic properties; Clausius Clapeyron equation
• ISSN: 0021-9614; 1096-3626
• DOI: 10.1016/j.jct.2008.07.023

In this paper, the sublimation pressure of Ar, Kr, and Xe are obtained as functions of temperature from an exactly integrated form of the Clapeyron equation. No fitting to experimental data of the equilibrium pressure has been necessary. The deviation plots of the sublimation pressure show that the results are satisfactory. The derived enthalpy of sublimation of the three rare gases from T = 0 K up to their respective triple point temperatures are asymmetric, distorted parabolas showing maxima for C p ,m g = C p ,m s . The Δ s g H m ( T = 0 K ) , which is a measure of the cohesion energy of the solid crystals, is easily calculated. A general equation has been obtained for Δ s g H m as a function of temperature which also gives the enthalpies of sublimation of neon and radon. The (s + ℓ + g) triple point coordinates of Rn are reassessed.