Preparation of Nd–Fe–B by nitrate–citrate auto-combustion followed by the reduction–diffusion process

摘要: The Nd2Fe14B alloy has been successfully synthesized by nitrate–citrate auto-combustion followed the reduction and diffusion process with low energy consumption. H3BO3, Fe(NO3)3·9H2O, Nd(NO3)3·6H2O were used as precursors citric acid was chelating ligand of metal ions. Ammonia water to adjust pH 7. CaH2 a reducing agent for process. NdFeO3 Fe2O3 produced during gel. combustion gel investigated TGA/DTA curve measurements. phase compositions studied XRD differences overall morphology magnetic properties measured SEM, TEM vibrating sample magnetometry (VSM) at 300 K. comparison reduced samples between pellet type random powder done VSM it showed better Nd2Fe14B. Making compact is more efficient solid transition higher coercivity.