(Received May 13, 1967)
A series of Cr23C6-type borides was investigated by means of thermomagnetic measurements. The atomic magnetic moment (Curie temperature) of (Fe, Co)20Al3B6 increases linearly from about 0.6 Bohr magnetons (403°K) for Co20Al3B6 to a value of 1.5 Bohr magnetons (815°K) for Fe3Co12Al3B6. Partial replacement of the Ni in non-magnetic Ni20Al3B6 by Fe also causes a smooth increase in moment (Curie temperature) and gives a value of 0.5 Bohr magnetons (285°K) for Fe3Ni12Al3B6. (Co, Ni)20Al3B6 exists in a perfect solid solution and shows a peak in moment (Curie temperature) vs. composition curve at about Co17Ni3Al3B6.
These results can be accounted for in terms of an idea in which new magnetic moment is induced in these systems. ©1967 The Physical Society of Japan