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High-pressure studies of a ThMn12-type actinide compound: UFe5Al7

The ternary inter-metallic compound, UFe5Al7, 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 maintains the tetragonal symmetry as a function of pressure, while FeAl 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 26.0 GPa.