Vapor pressure and thermodynamics of Bk-249 metal
- 1 August 1982
- journal article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 77 (3) , 1464-1468
- https://doi.org/10.1063/1.443975
Abstract
The vapor pressure of 249Bk metal has been measured over the range 1100–1500 K, using combined target and mass spectrometric Knudsen effusion techniques. Vapor pressure data are combined with an appropriate estimate for the solid heat capacity and the estimated crystal entropy S°298, to produce enthalpy, entropy, and free energy functions from 298 to 2000 K. The vapor pressures are described by the equations: Log10 P(atm) = −(15 718 ±253)/T+578±0.21 [solid, 1107–1319 K], Log10 P(atm) = −(14 902 ±244)/T+5.14±0.17 [liquid, 1345–1528 K] from which we calculate Δ H°298 (2nd law) = 73 960±1150 cal/mol [solid], Δ H°298 (2nd law) = 73 980±1120 cal/mol [liquid], and Δ H°298 (3rd law) = 74 220±180 cal/mol [solid and liquid].Keywords
This publication has 7 references indexed in Scilit:
- High temperature vaporization and Raoult’s-law studies with 243Am metalThe Journal of Chemical Physics, 1979
- Thermodynamic properties of 5f elementsJournal of Inorganic and Nuclear Chemistry, 1978
- The i.r. spectrum of berkelium-249Spectrochimica Acta Part B: Atomic Spectroscopy, 1977
- Generalized phase diagram for the rare-earth elements: Calculations and correlations of bulk propertiesPhysical Review B, 1975
- The vapor pressure of high-purity solid and liquid curiumThe Journal of Chemical Physics, 1975
- The α-γ transition in cerium is a Mott transitionPhilosophical Magazine, 1974
- Some properties of berkelium metal and the apparent trend toward divalent character in the transcurium actinide metalsInorganic and Nuclear Chemistry Letters, 1972