A PROPOSED CATALYTIC MECHANISM OF PD ON THE FORMATION OF UBE13 IN EXPERIMENTAL CONSTRUCTION OF U-PD PHASE DIAGRAMS


37th Annual CNS Conference - 2017 June 04-07

Presented at:
37th Annual CNS Conference
2017 June 04-07
Location:
Niagara Falls
Session Title:
3B3 - Chemistry & Materials

Authors:
M.H. Kaye (UOIT)
L.C. Wang (UOIT)
  

Abstract

In previous U-Pd phase diagram determinations, contamination reactions of berrylia crucibles were observed.  Measures were taken to reduce the amount of beryllium in the samples; however, the possibility of formation of a very stable metallic compound, UBe13, was neglected.  The measured U-rich side eutectic temperature and composition and the Pd-rich side liquidus were controversial and much higher than the calculated results.  Thermodynamic evaluation shows that crucible contamination (the formation of UBe13 catalyzed by Pd) changed the system from a binary to a ternary one and made the identification of compounds and determinations of phase boundaries extremely difficult.  By comparing the binary phase diagrams of U-transition metals around Pd, and using the results of Local Density Approximation and the contamination reaction identified in this paper, a possible catalytic mechanism of Pd in the metallic system is proposed.  

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