Crystal structure of praseodymium germanide PrGe_1.91

Chem. Met. Alloys 10 (2017) 69-75

https://doi.org/10.30970/cma10.0357

Igor SAVYSYUK, Nataliya SEMUSO, Roman GLADYSHEVSKII

The structure of the binary germanide PrGe_1.910(7) has been determined by single-crystal X-ray diffraction: Pearson symbol oS36-12.72, space group Cmmm, a = 4.2721(6), b = 30.673(4), c = 4.1433(6) Å, Z = 8. The structure is a derivative of the type TbGe₂ and related to the types (Sm,Lu)Ge_1.85 and DyGe_1.85. These types can be represented as a linear intergrowth of three consecutive AlB₂-type slabs of trigonal prisms and two CaF₂-type slabs.

CaF₂-type slab in the structure of PrGe_1.91.

Keywords

Germanide / Praseodymium / Single-crystal X-ray diffraction / Crystal structure / Vacancy derivative