By thermo-magnetic, differential dilatometric, and electric resistance methods, the anomalous changes in the α phase of the Ni-Sb system found previously by X-ray analysis has been studied, and it has been clarified that the change is due to the formation of a superstructure, i.e., in the transition from dis-order to order state the dilatation-temperature curves show contraction, electric resistance-temperature curves show decrement, and magnetization-temperature curves show inflection. The temperature at which the ordered structure,
a' phase (Ni
15, Sb), forms has been measured by dilatometric method and has been assigned to be about 460°, and the range of its existence at room temperature has been assumed as 88_??_90% Ni. Further, the
a' phase has been found to be paramagnetic, and hence the curie point of Ni lowers by addition of Sb down to the saturation point of
a' phase (92.5% Ni) in the
a phase, and in the two phase (
a+
a') range (94.5_??_90% Ni) the curie point of saturated
a phase (Fig. 2, point B) apears at 207°. By further addition of Sb the curie point disappears in the range 90_??_88% Ni, but when the addition of Sb exceeds 12% and causes the appearance of two phase (
a+
a') range (88_??_84% Ni), the curie point of saturated α phase (Fig. 2, point F) is found at 94°. The curie point of saturated
a phase (Fig. 2, point G) in the two phase range of
a+δ is assigned as 58° as previously reported.
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