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The structure of the distorted anti-perovskite nitride Ca3AsN has been studied both by neutron powder diffraction at 305 and 15 K and by X-ray powder diffraction at room temperature. Ca3AsN is distorted to an orthorhombic cell with a and b ‡ a′ and c ∼ 2a′, where a′ is the lattice constant of the ideal undistorted cubic anti-perovskite. The distortion is produced by tilting of octahedra of Ca6N and results in six short and six long bond distances of the twelvefold coordinated As atom by Ca atoms.
Chern et al. (Sat,) studied this question.