The two ternary phases W5As2.5P1.5 and Ni4Nb5P4 have been investigated by X
-ray powder diffraction. Precise data for the two compounds were collected
using Cu K alpha(1) radiation over the range 11 degrees-140 degrees 2 theta
. Unit cell refinements (space group I4/m) led to a = 9.4729(3)Angstrom, c
= 3.2414(2)Angstrom (D,=13.16 g cm-3) with M-20=127, F-30=91(0.0092,36) for
W5As2.5P1.5 and a=9.9304(4) Angstrom, c=3.5243(3) Angstrom (D-x=7.87 g cm(
-3)) with M-20=179, F-30=138(0.0068,32) for Ni4Nb5P4. (C) 1999 Internationa
l Centre for Diffraction Data. [S0885-7156(98)00604-6].