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Title: Calculation of binary phase diagrams between the actinide elements, rare earth elements, and transition metal elements

Attempts were made to apply the Kaufman method of calculating binary phase diagrams to the calculation of binary phase diagrams between the rare earths, actinides, and the refractory transition metals. Difficulties were encountered in applying the method to the rare earths and actinides, and modifications were necessary to provide accurate representation of known diagrams. To calculate the interaction parameters for rare earth-rare earth diagrams, it was necessary to use the atomic volumes for each of the phases: liquid, body-centered cubic, hexagonal close-packed, and face-centered cubic. Determination of the atomic volumes of each of these phases for each element is discussed in detail. In some cases, empirical means were necessary. Results are presented on the calculation of rare earth-rare earth, rare earth-actinide, and actinide-actinide diagrams. For rare earth-refractory transition metal diagrams and actinide-refractory transition metal diagrams, empirical means were required to develop values for the enthalpy of vaporization for rare earth elements and values for the constant (C) required when intermediate phases are present. Results of using the values determined for each element are presented.
Authors:
Publication Date:
OSTI Identifier:
7203729
Report Number(s):
RFP-4450
ON: DE92019119
DOE Contract Number:
AC34-90DP62349
Resource Type:
Technical Report
Research Org:
EG and G Rocky Flats, Inc., Golden, CO (United States). Rocky Flats Plant
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; BINARY ALLOY SYSTEMS; PHASE DIAGRAMS; ACTINIDES; ENTHALPY; RARE EARTHS; TRANSITION ELEMENTS; VAPORIZATION HEAT; ALLOY SYSTEMS; DIAGRAMS; ELEMENTS; METALS; PHYSICAL PROPERTIES; THERMODYNAMIC PROPERTIES; TRANSITION HEAT 360102* -- Metals & Alloys-- Structure & Phase Studies