Rietveld Refinement of New Ternary Compound Al14Dy5Si

A new ternary compound Al14Dy5Si was discovered and studied by means of X-ray powder diffraction technique. The ternary compound Al14Dy5Si has a hexagonal BaPb3-type structure, space group R 3 m (No. 166), the lattice parameters a = 0.61482(1) nm, c = 2.09780(2) nm. The crystal structure of the compound Al14Dy5Si was successfully refined by using Rietveld method from X-ray diffraction data. The R-factors of Rietveld refinement are Rp = 0.091 and Rwp = 0.120, respectively. The thermal dependence of the magnetization (M-T curves) for the compound was measured by a vibrating sample magnetometer. The experimentally determined magnetic effective paramagnetic moment is μ eff = 23.22 μB per formula unit (10.36 μB per Dy atom).