Vapor pressure and thermodynamics of Bk-249 metal

Journal Article · Sun Aug 01 04:00:00 EDT 1982 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.443975· OSTI ID:5122369

Ward, J W; Kleinschmidt, P D; Haire, R G

The vapor pressure of /sup 249/Bk 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/sup 0//sub 298/, to produce enthalpy, entropy, and free energy functions from 298 to 2000 K. The vapor pressures are described by the equations: Log/sub 10/ P(atm) = -(15 718 +- 253)/T+578 +- 0.21 (solid, 1107--1319 K), Log/sub 10/ P(atm) = -(14 902 +- 244)/T+5.14 +- 0.17 (liquid, 1345--1528 K) from which we calculate ..delta.. H/sup 0//sub 298/ (2nd law) = 73 960 +- 1150 cal/mol (solid), ..delta.. H/sup 0//sub 298/ (2nd law) = 73 980 +- 1120 cal/mol (liquid), and ..delta.. H/sup 0//sub 298/ (3rd law) = 74 220 +- 180 cal/mol (solid and liquid).

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5122369
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 77:3; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ACTINIDES
BERKELIUM
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUID FLOW
GAS FLOW
HIGH TEMPERATURE
INFORMATION
KNUDSEN FLOW
METALS
NUMERICAL DATA
PHYSICAL PROPERTIES
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
VAPOR PRESSURE
VERY HIGH TEMPERATURE