Structural Variation Study of Cobalt Nanoparticles Synthesized by Co-Precipitation method using 59Co NMR

We have synthesized cobalt nanoparticles using co-precipitation method. Further, the two phases of the cobalt is monitored by varying the synthesis parameters. Co-59 NMR and XRD are used as characterization tools to study the phase variation in the cobalt samples. XRD and NMR results show a remarkable correlation in the two samples (Co-1 and Co-2). Co-2 has predominant fcc and hcp phases, whereas, Co-1 has fcc phase with lower amount of hcp. Both the samples show same saturation magnetization (M-s) but there is a remarkable difference in the phase composition. Thus, Co-59 NMR appears to be a good tool to identify the phase purity of the ferromagnetic cobalt samples.