Abstract
We have investigated systematically the relationship of ferromagnetic properties of polycrystalline Ca 1+ δ B 6 ceramics with Ca content, as δ ranges from −0.05 to 0.05. We demonstrated that the origin of the high-temperature ferromagnetism observed in CaB 6 can be ascribed to the existence of Fe containing impurity phases. For δ < 0 (Ca deficiency) Fe exists as boride, whereas for δ>0 (excess Ca) it is present as oxide. The dependence of magnetization with the nominal stoichiometry of Ca 1+ δ B 6 can be understood from the evolution of Fe boride and oxide phase in the materials.
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