D. Chandra, M. A. Coleman, University of Nevada, Reno, NV; J. R. Wermer, S. N. Paglieri, Los Alamos National Laboratory, Los Alamos, NM; T. J. Udovic, National Institute of Standards and Technology, Gaithersburg, MD
The hydriding properties of Zr2Fe and Zr3Fe alloys have been investigated. The equilibrium phase stability of Zr2Fe and Zr3Fe were determined during an annealing study of both phases. During hydriding experiments, disproportionation of the Zr2Fe alloys was determined to occur, based on x-ray diffraction patterns of alloys hydrided at temperatures ranging from 303 K to 773 K, at temperatures above 673 K. In Zr3Fe the temperature at which disproportionation takes place is much lower, being between 473 and 573 K. The thermodynamics of hydride formation for these alloys were determined from pressure composition isotherms recorded at temperatures between 303 and 773 K. Characterization of Zr-Fe hydride products has been conducted using inelastic neutron scattering techniques. Neutron scattering has proven useful in differentiating between the similarities in x-ray diffraction patterns of the two hydrides.
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