Equilibria and thermodynamic properties of the plutonium-hydrogen system
Equilibrium, kinetic and x ray diffraction data show the existence of two stability regimes in the Pu-H system. A metastable solid solution between CaF/sub 2/-type PuH/sub 1/ /sub 9/ and anti-Fe/sub 3/Al-type PuH/sub 3/ /sub 0/ forms at low temperature and behaves as an ideal solid solution. Equilibrium and calorimetric results show that the enthalpy of formation varies linearly from -38 to -50 kcal/mol between the lower phase boundary and the trihydride. The phase relationships established at high temperature are similar to those of the lanthanide difluoride-lanthanide trifluoride systems. A series of CaF/sub 2/-related phases apparently forms between PuH/sub 1/ /sub 9/ and PuH/sub 2/ /sub 5/; a nonstoichiometric hexagonal (LaF/sub 3/-type) hydride exists in the range PuH/sub 2/ /sub 9/-PuH/sub 3/ /sub 0/. A procedure for preparing pure hexagonal puH/sub 3/ /sub 00/ is described, and the hysteresis behavior of the Pu-H system is discussed.
- Research Organization:
- Rockwell International Corp., Golden, CO (USA). Rocky Flats Plant
- DOE Contract Number:
- EY-76-C-04-3533
- OSTI ID:
- 5709833
- Report Number(s):
- RFP-2980; CONF-800402-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400702* -- Radiochemistry & Nuclear Chemistry-- Properties of Radioactive Materials
ACTINIDE COMPOUNDS
DISPERSIONS
EQUILIBRIUM
HYDRIDES
HYDROGEN COMPOUNDS
MIXTURES
PHYSICAL PROPERTIES
PLUTONIUM COMPOUNDS
PLUTONIUM HYDRIDES
SOLID SOLUTIONS
SOLUTIONS
THERMODYNAMIC PROPERTIES
TRANSURANIUM COMPOUNDS