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026ChemInform Abstract The magnetic properties of Fe atoms and their distribution in Fe-B solid solutions are studied in the temp. range 3.6-300 K. At low Fe content, iron atoms occupy the A holes of the β-rhombohedral structure. At higher Fe content, iron is additionally ocated in the D holes. Iron atoms in the A and D holes interact to form antiferromagnetic clusters (pairs). Fe in the A hole is responsible for compensation of the hole trapping levels near the valence band edge. For Fe3+ present in the A holes, a low spin value, S = 1/2, is bserved as a result of a strong crystal field strength of the ligands. In the D holes, Fe is present in the Fe2+ state having a magnetic moment of µeff = 4.20.

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