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The lattice parameters of the neptunium monopnictides (NaCl crystal structure) have been measured between 5 and 300°K by X‐ray diffraction. NpN becomes ferromagnetic at 87°K. At TC a rhombohedral distortion, which indicates that the 〈111〉 is the easy axis, is observed. At 5°K, the rhombohedral angle is 60.46 ± 0.02°. NpP exhibits a tetragonal distortion at 74°K, at which temperature the antiferromagnetic 3+, 3− structure becomes commensurate with the lattice. At 5°K c/a = 0.9958 ± 2. NpAs becomes tetragonal at TN = 175°K when the material has a 4+, 4− structure. However, NpAs returns to being a cubic at 142°K at which temperature the magnetic structure is the simple + − (type I) configuration. The ‘return’ to cubic is first order; the volume of the unit cell expands by 0.23%. NpSb, which orders antiferromagnetically at 207°K with the type I structure remains cubic in the ordered regime.

Magnetically Induced Lattice Distortions in the Neptunium Monopnictides