Abstract
The ternary phosphide Tb16Ni36P22 has been prepared by direct are melting of the components present as pure metals and red phosphorus. The crystal structure has been determined using X-ray powder diffraction data (diffractometer DRON-3M, Cu Kα-radiation). The compound exhibits a new type of crystal structure. P6m2 with lattice parameters a=18.049(1), c=3.8154(2) Å. Least square refinement of atomic positional and thermal parperties by a Rietveld method resulted in R1=0.095 and Rprot=0.146. The crystal structure belongs to the large family of hexagonal flat structures with trigonal prismatic arrangement of the smallest atoms (phosphorus). The compounds Ln16Ni36P22 (where LnCe, Pr, Nd, Sm, Eu, Gd and Dy) adopt the same crystal structure as Tb16Ni36P22. Lattice parameters of these compounds have been refined using powder diffraction data.
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