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The fusion curves of xenon, krypton, and argon
Ferreira, A. G. M.; Lobo, Lélio Q.The experimental results on the fusion of the heavier rare gases at very high pressures, obtained in the last 20 years, are examined and analysed in conjunction with the measurements made at lower pressures from 1940 onwards. The parameters in the Simon equation for the melting curves of Xe, Kr, and Ar are determined, and the coordinates of a possible high-pressure s(fcc) + s(hcp) + l triple-point are identifie...
On the vapour pressure of radon
Ferreira, A. G. M.; Lobo, Lélio Q.The few, rather scarce, and old data on the vapour pressure and sublimation pressure of radon are re-examined in light of the Wagner equation, which is applied for the first time (as far as we are aware) to the sublimation curve. Numerical coefficients have been established for the representation of both equilibrium curves, and estimates are advanced for the coordinates of the critical point, the triple-point, ...
Phase equilibria from the exactly integrated Clapeyron equation
Lobo, Lélio Q.; Ferreira, Abel G. M.In this work, the exactly integrated form of the Clapeyron equation found by Mosselman et al. has been used in a systematic manner to derive a comprehensive set of equations describing the first-order transition curves of pure substances. The application of each of these equations requires the knowledge of only one (reference) point on the particular equilibrium line, of the corresponding enthalpy of transition...
Error analysis in Barker's method: extension to ternary systems
Fonseca, I. M. A.; Lobo, Lélio Q.An extension of Barker's method to ternary systems is briefly outlined. Expressions for the standard deviations of the excess molar Gibbs free energy and the equilibrium pressure as functions of composition are obtained. These expressions are applied to accurate experimental data for the cryogenic (liquid) mixture CH3F+N2O+Xe recently measured in our laboratory. ; http://www.sciencedirect.com/science/article...
(Vapour + liquid) equilibria of (fluoromethane + tetrafluoromethane) at the tem...
Fonseca, I. M. A.; Sardinha, G. G.; Lobo, Lélio Q.The total vapour pressure of binary liquid mixtures of (fluoromethane+tetrafluoromethane) has been measured at the temperature 130.46 K. Two partially miscible liquid phases were found. The excess molar Gibbs energy was calculated in the region where the two liquids are mutually soluble. For the hypothetical equimolar mixture,GEm01 (x=0.5)=846 J<@TBLEND>mol-1. ; http://www.sciencedirect.com/science/article/B...
Thermodynamic properties of liquid carbon tetrafluoride
Lobo, Lélio Q.; Staveley, Lionel A. K.Avaliable thermodynamic data on CF, have been collected and thelr rellabllity examlned. They have been used to calculate the values of the following properties: (1) the enthalpy of vaporizatlon of the llquld from the trlple polnt (89.56 K) to 220 K; (2) the conflguratlonal Internal energy of the liquid and gas at the Saturation vapor pressure, and the adlabatlc compresslblllty of the llquld over the same range;...
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