Evolution of magnetic properties of crystalline cobalt-iron boride nanoparticles via optimization of synthesis conditions using hydrous metal chlorides

Chemical synthesis of crystalline and nanoscale cobalt-iron metal boride powders was studied using hydrous chlorides NaBH4. The effects precursor concentration optimized conditions on the phase formation, microstructure, magnetic properties were investigated. After applying a reaction CoCl2·6H2O-FeCl3·6H2O-NaBH4 at 850 °C, (CoFe)B2, (CoFe)B, Co2B, Fe3B, Fe0.71Co0.29 phases obtained from different applied under autogenic pressure or Ar flow atmosphere. Oxychloride impurities reason for reduced magnetization values. highest saturation 183 emu/g belongs to nanoparticles containing (CoFe)B2 (CoFe)B pure phases. High temperature measurements marked synthesized as soft materials up 795 K while no Tc reached