Direct synthesis of l10 feni and other metal alloys from metal-cyano/ nitrosyl complexes
AssigneeConsiglio Nazionale Delle Ricerche
InventorsAldo CAPOBIANCHI, Gaspare VARVARO, Patrizia IMPERATORI
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Abstract
An effective and easily scaled-up chemical synthesis route to obtain L10 Iron-Nickel alloy from cyano/nitrosyl-metal complex precursor salts, for sustainable permanent magnets free of critical rare-earth elements, with a (BH)max ranging in between that 5 of hexaferrites (up tO~45 kJ/m3) and rare-earth-based permanent magnets (up to ~500 kJ/m3).
Claims8
A process for the preparation of a bimetallic/trimetallic alloy having chemically ordered crystal structure, wherein it involves the following steps:
- reduction of a cyano/nitrosyl-metal complex salt having alternating mononuclear layers in a reactor through a reducing agent, supplying heat to the reactor, with a heating rate equal or greater than 0.1° C./min, at a temperature between 200° C.-450° C., for a reaction time between 12 and 72 hours.
Use of a bimetallic alloy having an L10 ordered crystal structure, being composed by the metals Fe and Ni, wherein the L10 alloy has a coercivity up to 66 mT and a saturation magnetization higher than 130-140 KAm2/kg. FeNi L10 alloy could be used as a starting material in a preparation of a permanent magnet after a process improvement.
Dependencies are inferred from the claim text.