New compounds with Sc2Re3Si4-type
structure in the systems R–{Zr,Hf}–Ge
Chem.
Met. Alloys 8 (2015) 98-105
https://doi.org/10.30970/cma8.0328
Maryna BOYKO, Nataliya MUTS,
Yaroslav TOKAYCHUK, Roman GLADYSHEVSKII
Fifteen Sc2Re3Si4-type
(Pearson symbol tP36, space group P41212)
compounds, Y2{Zr,Hf}3Ge4, Gd2{Zr,Hf}3Ge4,
Tb2{Zr,Hf}3Ge4, Dy2{Zr,Hf}3Ge4,
Ho2Hf3Ge4, Er2{Zr,Hf}3Ge4,
Tm2{Zr,Hf}3Ge4, and Lu2{Zr,Hf}3Ge4,
were synthesized and characterized by means of X-ray diffraction and energy-dispersive
analyses. The crystal structures of two alloys in the Tm-Zr-Ge
and Ho-Hf-Ge systems (Tm0.88(4)Zr4.12(4)Ge4, a = 7.3457(5),
c = 13.388(1) Å; Ho1.38(8)Hf3.62(8)Ge4,
a = 7.3139(6), c = 13.3550(13) Å) were refined by the
Rietveld method on X-ray powder diffraction data. In both structures one of the
atom sites was found to be occupied by a statistical mixture of rare-earth
metal and Zr (Hf) atoms.
Projection of the unit cell of the structure of
Tm0.88(4)Zr4.12(4)Ge4 onto the bc plane and coordination polyhedra of
the atoms
Keywords
Rare-earth metals / Zirconium / Hafnium /
Germanium / X-ray powder diffraction / Crystal structure