Synthesis, structural, magnetic, and cytotoxic properties of iron oxide coated iron/iron-carbide nanocomposite particles J. Appl. Phys. 98, 114306 (2005); 10.1063/1.2138375 Magnetic properties of ultrafine cobalt ferrite particles J. Appl. Phys. 93, 7486 (2003); 10.1063/1.1540145Particle features, oxidation behaviors and magnetic properties of ultrafine particles of Ni-Co alloy prepared by hydrogen plasma metal reaction Oxidation of Fe ultrafine particles has been studied in air at temperatures ranging from 300 to 873 K. It is found that ␥-Fe 2 O 3 and ␣-Fe 2 O 3 are formed at different temperatures, which leads to significant changes in the particle features and magnetic properties.
Ni–Co ultrafine particles (UFPs) were prepared by hydrogen plasma metal reaction. Particle characteristics, oxidation, and magnetic properties were investigated and compared. fcc structured Ni–Co UFPs with a sphere shape were prepared over the whole composition range. The particles distribute from 5 to 100 nm in size with an average particle size of about 35 nm. They are thermally stable in air below 433 K, but oxidize quickly at the higher temperatures. The saturation magnetization of the UFPs is lower than that of the corresponding bulk alloy, especially in the Co rich side. Formation of oxide layer on the particle’s surface is an important reason for this reduction. Ni–Co UFPs possess large residual magnetization and coercive force above 60% Co. The composition dependence of the saturation magnetization and the coercive force changes remarkably around 60% Co, which implies a large variation in magnetic status around this composition.
Structural changes of the intermetallic compound SmCo5 after hydrogenation and nitrogenation were investigated by x-ray diffraction, transmission electron microscopy, and differential scanning calorimetry. Amorphization was not observed by hydrogenation of SmCo5. On the contrary, an amorphous a-SmCo5N1.2 alloy was synthesized by nitrogenation.
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