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The microstructure of FeCuB ribbons (∼20 μm thick) was modified to fabricate α′′-Fe 16N 2 at a temperature as low as 160 °C. The ribbon samples were heat treated first at a temperature reaching 930 °C and then quenched down to room temperature. During the heat treatment, ribbon samples were oxidized, and hydrogen reduction was then conducted to remove the oxygen from the ribbon samples. The reduced ribbon samples had a porous structure, which improved the nitrogen diffusion efficiency and decreased the fabrication temperature of α′′-Fe 16N 2 down to 160 °C. It was demonstrated that the techniques for microstructure control in this method including oxidation and reduction helped obtain the α′′-Fe 16N 2 phase with high coercivity, thus manifesting this could be a promising technique for low-temperature nitridation on ribbons in general.
Bibliographical noteFunding Information:
Parts of this work were carried out in the Characterization Facility, University of Minnesota, which is partially supported by the National Science Foundation through the University of Minnesota MRSEC under Award Number DMR-1420013. Authors thank the partial support from the Institute for Rock Magnetism, Department of Earth Science, University of Minnesota, Twin Cities, for the use of instruments. We are grateful to Dr John Larson and Mr Chad Carda of Niron Magnetics Inc. for their help in ribbon preparation.
© 2019 The Royal Society of Chemistry.