Abstract
ABSTRACTThe crystal structures of the Gd8Ag19.5(2)Al45.2(2) (Gd4(Ag0.294Al0.706)32Ag0.340) and Ho8Ag21.2(2)Al43.3(2) (Ho4(Ag0.323Al0.677)32Ag0.252) compounds, which adopt the Yb8Cu17Al49-type structure with the space group I4/mmm, have been investigated by means of the X-ray powder diffraction. The structures of the compounds are characterized by the silver/aluminum mixing on several atomic positions and the partial occupancy of silver atoms on one atomic position. dc and ac magnetic data indicate antiferromagnetic properties below 46.5 K for Gd8Ag19.5Al45.2 and 15 K for Ho8Ag21.2Al43.3. In case of RE = Gd an anomaly observed in its magnetic susceptibility at 3.5 K suggests a magnetic transition of the order-order type. A metamagnetic phase transition is detected for RE = Ho.
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