Magnetic particles derived from iron nitride |
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Authors: | Matar SF Demazeau G Siberchicot B |
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Affiliation: | Lab. de Chimie du Solide du CNRS, Bordeaux I Univ., Talence; |
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Abstract: | Due to its high saturation magnetization (σs(0K)≈208 emu/g) and to the ease of obtaining it as a particulate material, Fe4N could be a suitable magnetic material for replacing highly reactive metallic iron pigments (σ s(0K)≈218 emu/g) in high-density recording. Throughout a nitriding process of properly selected precursors Fe4N can be obtained in either of two morphologies: acicular or isotropic. Further protection of the magnetic particles can be ensured through coating of the precursor particles prior to thermal decomposition in NH3/H2 atmosphere or through substitutions with selected elements. The obtained passivated nitrides are characterized by high magnetic properties (Hc≈600 Oe; σs≈150 emu/g) and chemical stability well adapted for use as magnetic pigments for high-density recording |
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