A ternary compound Al1.5Ni3.5Pr was synthesized experimentally. The crystal structure analysis and refinement using powder X-ray diffractometer and Rietveld refinement method. The refinement results show that Al1.5Ni3.5Pr is isostructural with Al2NdNi3 and possesses a hexagonal CaCu5 structure type; further, The Pearson symbol is hp6, lattice constants a, c, unit cell volume V, the unit z, and calculated density ρx are 5.0814(3) Å, 4.0855(3) Å, 91.359 Å3, 1 and 7.034 g/cm3, respectively. Accordingly, its residual factors are Rp = 10.09%, Rwp = 13.83%, and Rexp = 6.66%.
Quaternary alloy Al8Cu3FePr was melted in the nonconsumable arc-furnace under an argon atmosphere. The microstructure of the alloy was observed and analyzed by scanning electron microscope after high temperature annealing. It indicates that the alloy is a single-phase alloy with uniform chemical composition. Then, the crystal structure of Al8Cu3FePr alloy was determined by powder x-ray diffraction technology. The results show that Al8Cu3FePr is isostructural with Al8Cu4Pr crystallizes in the Mn12Th-type structure, lattice parameters a = 8.8299(1) Å, c = 5.1582(1) Å, unit-cell volume V = 402.18 Å3 , formula units per unit cell z = 2, calculated density ρx = 4.981 g/cm3 , F30 = 122.6(0.006, 46), the space group I4/mmm(No.139), and the reference intensity ratio value obtained experimentally is 1.20.
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