Nanocomposites FeCoNi/C based on polyvinyl alcohol: synthesis and electromagnetic properties

Triple FeCoNi nanoparticles distributed and stabilized in the carbon matrix of FeCoNi/C metal-carbon nanocomposites were synthesized. The synthesis was carried out by controlled IR pyrolysis precursors "polymer-metal nitrates" type, obtained joint dissolution components with subsequent removal solvent. effect temperature on structure, composition, electromagnetic properties has been studied. It shown XRD that formation ternary occurs through Fe NiCo solid solution. With an increase temperature, size metal increases, which is determined processes their agglomeration coalescence during rearrangement. Also, depending a alloy different compositions can be formed, ratio metals specified precursor achieved at 700 °C. By Raman spectroscopy that, degree crystallinity graphene structures consisting several layers formed. frequency dependences relative complex dielectric magnetic permeabilities range 3–13 GHz causes significant both losses (~ 2 times). former are associated nanostructure nanocomposite, while latter shift EFMR to low-frequency region. Reflection loss (RL) calculations performed according standard procedure based experimental data permittivity. control absorption value waves (from 50 94%) changing nanocomposites.