Chem.
Met. Alloys 5
(2012) 166-172
https://doi.org/10.30970/cma5.0226
Nataliya MUTS, Oleg SHCHERBAN,
Roman GLADYSHEVSKII
The
crystal structure of Pr(Ni0.23Al0.03Ge0.74)1.85
(composition from EDX analysis) has been refined on
powder and single-crystal X-ray diffraction data. The solid solution Pr(Ni,Al,Ge)2-x, which
extends from ternary Pr(Ni,Ge)2-x,
crystallizes with the hexagonal AlB2 structure type, Pearson symbol hP3, space group P6/mmm. The refinement on
X-ray powder diffraction data led to the composition PrNi0.42Al0.06Ge1.34(2)
with 9 % vacancies on the 2-fold site inside the trigonal
prisms, a = 4.1622(1), c = 4.2157(2) Å (Rp =
0.0212, Rwp
=
0.0265, RB
=
0.0742), whereas the composition of the single crystal refined to Pr(Ni0.23Al0.03Ge0.74)2.00(1)
(a = 4.156(1), c = 4.209(2) Å, R = 0.0275, wR =
0.0516), when the Ni:Al:Ge ratio was fixed to the value
found by the EDX analysis.
Keywords
Praseodymium
/ Nickel / Alumogermanide / X-ray powder diffraction
/ X-ray single-crystal diffraction /