The Ho-Ni-Ge system has been investigated at 1070 K 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 1070 K 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, Dy3Ni11Ge4) compounds have been found to show paramagnetic behavior down to 5 K, whereas Ho3Ni2Ge3 exhibits an antiferromagnetic transition at ∼7 K. Additionally, the crystal structure of the new isostructural phases Y, YbNi3Ge2 (ErNi3Ge2-type), Er3Ni11Ge4 (Sc3Ni11Ge4-type) and Y, Tb, Dy, Er, Tm3Ni2Ge3 (Hf3Ni2Si3-type) has been also investigated.
The Ho-Ni-Ge system: Isothermal section and new rare-earth nickel germanides
PANI, MARCELLA;PROVINO, ALESSIA;MANFRINETTI, PIETRO
2015-01-01
Abstract
The Ho-Ni-Ge system has been investigated at 1070 K 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 1070 K 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, Dy3Ni11Ge4) compounds have been found to show paramagnetic behavior down to 5 K, whereas Ho3Ni2Ge3 exhibits an antiferromagnetic transition at ∼7 K. Additionally, the crystal structure of the new isostructural phases Y, YbNi3Ge2 (ErNi3Ge2-type), Er3Ni11Ge4 (Sc3Ni11Ge4-type) and Y, Tb, Dy, Er, Tm3Ni2Ge3 (Hf3Ni2Si3-type) has been also investigated.
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