[Cl-].[NH4+].[Cl-].[Nd+3:4].[Cl-].[Cl-].[C:7](=[O:10])([O-:9])[O-:8].[Na+].[Na+]>[Co](Cl)Cl>[C:7](=[O:8])([O-:10])[O-:9].[Nd+3:4].[C:7](=[O:8])([O-:10])[O-:9].[C:7](=[O:8])([O-:10])[O-:9].[Nd+3:4]A solution of cobalt chloride having a gravity of 1.20 g/cm3 containing ammonium chloride was mixed while stirring with a solution of neodymium chloride and heated to 50° C. A stoichiometric equivalent quantity of sodium carbonate solution of 60° C. having a gravity of 1.05 g/cm3 was added to the mixed solution while stirring. The precipitates of cobalt carbonate and neodymium carbonate were obtained after reaction, filtrated in a vacuum filtrator to remove the mother liquid, washed by distilled water of 90° C. for 6 times, dried at 200° C., crushed and sieved by a 20 mesh sieve, reduced at 600° C. in hydrogen for 3 h, then crushed again and sieved by a 100 mesh sieve. The prepared cobalt powder contained 2.8% (wt.) neodymium.
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