Figure 4.

Upper part: Comparison between the two structures of Ho2Ni0.8Si1.2 (Zr2Ni0.48P type; oP32; Pnma) and Ho3NiSi2 (Gd3NiSi2 type; oP24; Pnma), showing characteristic trigonal-prismatic coordination and similar orientation and concatenation of the respective structural motifs. Lower part: Linking of the trigonal prisms in the binary compounds HoNi (FeB type) and HoSi (low-temperature CrB type).