Abstract
Iron nitride powders, with composition Fe 4N, have been prepared from Nd-containing precursors using pure ammonia (NH 3) gas. The precursors were a mixture of iron oxide and neodymium hydroxide made by coprecipitation of metal salts (FeCl 3) and Nd(NO 3) 3·6H 2O) with sodium hydroxide (NaOH) in aqueous solution. The presence of Nd 3+ ions in the system promoted the formation of Fe 4N. The as-made sample has a saturation magnetization of 150 emu/g (200 emu/g if only the mass of the iron nitride is included). The high magnetization is due to the protection of the particle surface by the neodymium oxide.
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