Pd3P, which crystallises in the cementite, Fe3C-type structure, forms a solid solution with nickel. The crystal structure contains two crystallographically different palladium sites (8d and 4c). Refinements of neutron powder diffraction intensities using the Rietveld method show that all nickel atoms occupy the eight-fold position. The unit cell parameters were refined to a=5.7812(4) Angstrom, b=7.4756(6) Angstrom and c=5.1376(4) Angstrom, for (Pd2.7Ni0.3P0.94)-P-..