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Nanostructured Fe and Fe 50 Co 50 powders were prepared by high-energy ball milling. Microstructural and magnetic properties changes with milling time were followed by x-ray diffraction, differential scanning calorimetry and vibrating sample magnetometry. The nonequilibrium microstructure originates from a grain size reduction to about 12 nm and the introduction of internal strain up to 1.5% (root-mean-square strain). The occurrence of disorder in the ball-milled powders is evidenced by the broad exothermic reaction during the heating of ball-milled samples, the variation of lattice parameters and the increase of the saturation magnetization during the first 3 h of milling for Fe and continuously for the Fe 50 Co 50 powder mixture. According to both the reduction of Fe Curie temperature, T c , and the increase of the phase transformation T α→γ , the paramagnetic temperature domain of nanostructured bcc α-Fe is extended by about 50 • C. The Fe 50 Co 50 nanostructured powder behaves as a soft ferromagnet with low values of both the coercive field and the squareness ratio M r /M s .

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The structural and magnetic properties of the investigated ZnO : (Al, Er) nanoparticle powders synthesized by hydrothermal method.

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