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New ternary phosphide Ni 7 Si 2 P 5  has been synthesized by direct interaction between powders of pure components at 1070 K and its crystal structure has been determined using X-ray single crystal method. The structure is of a new type with space group  Pbcn  (no. 60) and lattice constants as follows,  a  = 23.84(2) Å,  b  = 5.925(2) Å,  c  = 4.922(1) Å,  Z  = 4. The final residuals are  R F   = 0.048,  R w   = 0.044 for 362 symmetry independent reflections (diffractometer KM-4, Mo K α  -radiation). Crystal structure of Ni 7 Si 2 P 5  is closely related to Ni 2 SiP and Ni 5 Si 2 P 3  structures which belong to the series of linear inhomogeneous structures M 2 m +2 n  X 2 m +2 n   (M and X correspond to metal and non-metal atoms, respectively) and are derivatives from the MnP-type structure.

Preparation and crystal structure of the Ni 7 Si 2 P 5 phosphide