Thermodynamic properties of a quasi-ionic alloy from electromotive force measurements: The Li-Pb system

Journal Article · Wed Feb 15 04:00:00 EST 1978 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.435957· OSTI ID:5201956

Saboungi, M; Marr, J; Blander, M

Electromotive force measurements of the activity of lithium in lithium-lead liquid alloys are reported in the temperature range T=770-932 K. The partial molar excess Gibbs free energies are negative. Variations with composition exhibit an inflection point around an atomic fraction of lead equal to 0.2 which corresponds to the ratio of the valences of Li and Pb. The inflection point, as well as structural data, may be interpreted by assuming an at least partly ionic character of the alloy. A set of partial structure factors defined by Faber and Ziman are calculated as a function of the composition at the long-wavelength limit. Their variations support the hypothesis of a local short-range order around the above-mentioned composition (0.2). Finally, a modeling approach based on an electron transfer from Li to Pb is used to explain some of the characteristics of this class of alloys.

• Research Organization: Chemical Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439
• OSTI ID: 5201956
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 68:4; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360100* -- Metals & Alloys
ALLOYS
COOLING SYSTEMS
FLUIDS
LEAD ALLOYS
LIQUIDS
LITHIUM ALLOYS
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
THERMONUCLEAR REACTOR COOLING SYSTEMS
THERMONUCLEAR REACTOR MATERIALS