Abstract
The Ho–Ni–Ge system has been investigated at 1070K and up to ~60 at% Ho by X-ray diffraction and microprobe analyses. Besides the eight known compounds, HoNi5Ge3 (YNi5Si3-type), HoNi2Ge2 (CeAl2Ga2-type), Ho2NiGe6 (Ce2CuGe6-type), HoNiGe3 (SmNiGe3-type), HoNi0.2÷0.6Ge2 (CeNiSi2-type), Ho37÷34Ni6÷24Ge57÷42 (AlB2-type), HoNiGe (TiNiSi-type), Ho3NiGe2 (La3NiGe2-type), the ternary system contains four new compounds: Ho3Ni11Ge4 (Sc3Ni11Ge4-type), HoNi3Ge2 (ErNi3Ge2-type), Ho3Ni2Ge3 (Hf3Ni2Si3-type) and ~Ho5Ni2Ge3 (unknown structure). Quasi-binary solid solutions were observed at 1070K for Ho2Ni17, HoNi5, HoNi7, HoNi3, HoNi2, HoNi and Ho2Ge3, but no detectable solubility was found for the other binary compounds in the Ho–Ni–Ge system. Based on the magnetization measurements, the HoNi5Ge3, HoNi3Ge2 and Ho3Ni11Ge4 (and isostructural {Tb, Dy}3Ni11Ge4) compounds have been found to show paramagnetic behavior down to 5K, whereas Ho3Ni2Ge3 exhibits an antiferromagnetic transition at ~7K. Additionally, the crystal structure of the new isostructural phases {Y, Yb}Ni3Ge2 (ErNi3Ge2-type), Er3Ni11Ge4 (Sc3Ni11Ge4-type) and {Y, Tb, Dy, Er, Tm}3Ni2Ge3 (Hf3Ni2Si3-type) has been also investigated.
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