Abstract
The phosphides NiNbP 2 and NiTaP 2 crystallize in an orthorhombic unit-cell, space group Pnma and Z = 4. The X-ray structure of NiNbP 2 was determined from four-dimensional single crystal counter data and was refined to a final R value of 0.031 for 475 independent reflections. It shows square-pyramidal and 7-prismatic phosphorus coordination for Ni and Nb atoms respectively, and moreover exhibits zigzag and regular Ni-Ni chains bonded together by means of mixed irregular and almost linear Ni-Nb-Ni chains. The structure is derived from MoP 2 type and may be also considered as a mixture of MnP and WC type structures. Magnetic and electrical measurements indicate a metallic behavior of these new phosphides.
Published Version
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