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Abstract Neutron powder diffraction patterns are measured at 50°C and liquid nitrogen temperature. The crystal structure is defined as D88 (space group P63/mcm), in agreement with CASTELLIZ's data 2. It is found that the atoms in the 4 (d) and 6 (g) positions have magnetic moments of (3 ± 0.1) and (2 ± 0.1) Bohr magnetons, respectively. The spin direction is parallel to the 0001 axis.
R. Ciszewski (1963) studied this question.