The second moments in powdered sample have been found to be 23.5±3 gauss 2 at -110°C and 8.3±0.5 gauss 2 at room temperature. These values were interpreted by assuming the flipping and rotation of the NH 3 group. The change of the second moment occurs at about -50°C, which is lower than the Curie point of this crystal, 47°C. The line shape in a single crystal depends upon both orientations and temperatures; a fact suggesting a slight change of atomic configuration on both sides of the Curie point.
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Ryôsuke Hoshino (1962) studied this question.
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