Abstract
The ternary inter-metallic compounds, UFe5Al7 and UFe7Al5, crystallize in a tetragonal ThMn12 type structure. In the as-cast samples a residual phase of FeAl (~2%wt) was identified in the grain boundaries. The amount of the residual cubic phase of FeAl was determined by Rietveld analysis and reduced by the annealing process.UFe5Al7 and UFe7Al5 maintain the tetragonal symmetry as a function of pressure, while FeA1 keeps the cubic structure as was determined by the Rietveld analysis. The volume-pressure curve calculated from the X-ray analysis is V/V0=0.87 for UFe5Al7 at 26.0GPa and 0.89 at 24.6GPa for UFe7Al5.
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