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RE-free magnets Tetrataenite (L10-FeNi) is a promising alternative to rare-earth-…
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By Edited by Gerald Ondrey |

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RE-free magnets

Tetrataenite (L10-FeNi) is a promising alternative to rare-earth- (RE) based magnets due to its favorable magnetic properties, such as a high uniaxial magnetic anisotropy and saturation magnetic-flux density. Compared to other non-RE alternatives, such as Nd-Fe-B and Sm-Fe-N, which have a low thermal resistance, L10-FeNi has a Curie point of ≥550°C, which is higher than conventional magnets. However, L10-FeNi has only been found naturally in trace amounts in meteorites, so efforts to make the highly ordered alloy have been underway. Now, a Japanese collaboration, led by Denso Corp. (Aichi; www.denso.com), with support of the New Energy and Industrial Technology Development Organization (NEDO; Kawasaki; www.nedo.go.jp), has succeeded in synthesizing high-purity L10-FeNi for the first time, as reported in a recent issue of Scientific Reports.

The researchers developed a technique for ordering atoms in an alloy called nitrogen insertion and topotactic extraction (NITE). In this method, the ordered arrangement of Fe and Ni, with nitriding as the trigger, is combined with topotactic denitriding for extracting nitrogen atoms from Fe-Ni nitrides without damaging the crystal structure. The proposed method is significantly different from the conventional thermally activated process in that the ordered alloys can be derived directly by denitriding.

The proposed method not only significantly accelerates the development of magnets using L10-FeNi, but also offers a new synthesis route to obtain ordered alloys in non-equilibrium states. Such alloys can have improved mechanical (toughness) and catalytic properties.

 

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