High temperature vapor pressure of pure plutonium

Autor:	R. W. Ohse, M. H. Bradbury
Rok vydání:	1979
Předmět:	Chemistry Vapor pressure Vaporization Enthalpy General Physics and Astronomy chemistry.chemical_element Thermodynamics Enthalpy of vaporization Physical and Theoretical Chemistry Entropy of vaporization Atmospheric temperature range Standard enthalpy of formation Plutonium
Zdroj:	The Journal of Chemical Physics. 70:2310-2314
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.437736
Popis:	High temperature vapor pressure measurements have been made on pure plutonium metal by the Knudsen effusion technique. The reported experimental results extend into the transition region between molecular and viscous or hydrodynamic flow. Under the conditions used, linearity was observed up to temperatures in excess of 2200 K where pressures approaching 100 Pa were measured. The results over the temperature range 1724–2219 K yield log10PPu(Pa) = (9.735±0.105) −17066±208/T and the enthalpy and entropy of vaporization and the standard deviations therein are ΔH0v(Pu,1975 K) =326.78±3.97 kJ mol−1, ΔS0v(Pu,1975 K) =90.54±2.01 J K−1 mol−1. Based on the most recently available free energy functions for plutonium liquid and gas, the values of the standard enthalpy of vaporization calculated via second‐ and third‐law methods are ΔH0v(II, Pu,298 K) =344.14±3.97 kJ mol−1, ΔH0v(III, Pu,298 K) =341.67±1.26 kJ mol−1. Single crystal tungsten containers were used to hold the charge of plutonium and proved to be very sati...
Databáze:	OpenAIRE
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