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Abstract
The role of element boron in modifying the electronic and magnetic properties of alloys will be presented in some detail. This review will cover such properties of inter-metallic compounds where boron constitutes an important alloying element. The valence of the rare earth ions is tripositive, but, occasionally, it can fluctuate between 2 + and 4+ in some systems. The fluctuating valence systems in cerium and europium alloys with boron as an additional element will be described. The recent discovery of boron-carbide magnetic superconductors with relatively high transition temperature for alloys will be presented.