Crystal structure of the
compound Pr4Ge7
Chem.
Met. Alloys 2
(2009) 115-122
https://doi.org/10.30970/cma2.0102
Oleh
SHCHERBAN, Igor SAVYSYUK, Nataliya SEMUSO,
Roman GLADYSHEVSKII, Karin CENZUAL
The structure of the binary germanide
Pr4Ge7 has been determined by single-crystal X-ray
diffraction on a twinned crystal. It is an ordered vacancy derivative of the
α-ThSi2 type, Pearson symbol oS44, space group C2221,
a = 6.007(2), b = 13.987(4), c =
12.009(4) Å, isotypic to the structure reported
earlier for Nd4Ge7. The cell parameters of seven other
praseodymium germanides observed in samples annealed
at 873 K were refined from powder X-ray diffraction data.
Cell parameters corresponding to the
α-ThSi2 type and homogeneity ranges of the non-stoichiometric praseodymium digermanides
Q2 and Q1.
Keywords
Germanide / Praseodymium / Single-crystal
X-ray diffraction /