“…The Hg-type Ho sublattice appears to play the predominant role in determining the magnetic ordering of both phases, with following secondary effects produced by the semi-isolated Ho 6 clusters of Mg-type sublattice. The higher temperature magnetic transition of both these intermetallics (24, 27 K, respectively) is well in trend either with the magnetic ordering temperature of 32 K found in Er 5 Ge 3 [3], as well with the type of magnetic ordering recently determined for this compound [11]. The lower-temperature magnetic ordering of both compounds has no analogs among the already known magnetic structures of the Mn 5 Si 3 -type phases: Tb 5 Si 3 [7], Tb 5 Ge 3 [8], Tb 5 Sb 3 [18], Dy 5 Si 3 [9], Dy 5 Sb 3 [19] and Er 5 Si 3 [10].…”