Crystal structure of nickel selenide – Ni3Se2

The crystal structure of Ni3Se2 has been determined from the X-ray powder diffraction pattern. The unit cell is rhombohedral with a = 4.24 A, α = 90°38.6′, Z = 1, and space group R 32, D. The observed and calculated intensities agree for the following arrangement – 2 Se at and 3 Ni at .