Bouelkreb, I.Guittoum, A.Hemmous, M.Martínez-Blanco, D.Gorria, P.Blanco, J. A.Boukherroub, N.2022-01-032022-01-03202117932920https://www.worldscientific.com/doi/10.1142/S1793292021501484https://doi.org/10.1142/S1793292021501484https://dspace.univ-boumerdes.dz/handle/123456789/7541We have investigated the crystal structure, the microstructural and morphological characteristics, as well as the magnetic properties of Co nanoparticles (NPs) synthesized by a hydrothermal method. A series of samples has been elaborated for different concentrations of sodium hydroxide. The analysis of X-ray diffraction patterns, using two different wavelengths, has evidenced the coexistence of both α-Co and β-Co phases in the samples. The lattice parameter for both phases is in good agreement with those values expected for their bulk Co counterparts; the grain sizes of NPs were found to be dependent on the NaOH concentration. The scanning electron microscope micrographs show that Co NPs are agglomerated forming micrometer-sized entities whose shape evolves, indicating that the synthesis process affects the morphology of the powdered samples. Magnetic measurements indicate that the coercivity is slightly larger, HC>200 Oe, for Co NPs with dendritic-like shape, probably due to an increase in the magnetocrystalline anisotropyenCo NPsMagnetic nanomaterialsHydrothermal routeStructureMicrostructureMagnetic propertiesArticle