Magnetic Properties of Metastable BCC-Cobalt During Reduction of Cobalt Oxide (Co3O4)

• Published in: Journal of electronic materials Vol. 48; no. 12; pp. 7882 - 7887
• Main Authors: Qadri, S. B., Johnson, S. D., Qadri, S. N., Gorzkowski, E. P., Rath, B. B., Bussmann, K.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.12.2019; Springer Nature B.V
• Subjects: Argon; Body centered cubic lattice; Catalysis; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cobalt; Cobalt oxides; Electromagnetic shielding; Electronics and Microelectronics; Face centered cubic lattice; Heat treatment; Instrumentation; Magnetic fluids; Magnetic moments; Magnetic properties; Magnetic saturation; Magnetic shielding; Materials Science; Nanoparticles; Optical and Electronic Materials; Production methods; Solid State Physics; magnetic properties; XRD; Metastable phases; carbon nanotubes; Co; O
• ISSN: 0361-5235; 1543-186X
• DOI: 10.1007/s11664-019-07627-3

Cobalt Oxide (Co 3 O 4 ) was reduced to metallic Co using the nut shells of pistachio by heat treatment at temperatures of 1400°C and 1500°C in an argon gas atmosphere. This method for reducing Cobalt Oxide may provide a valuable route for reclaiming nanoparticles of metallic Co from waste material. Rietveld analysis of the x-ray diffraction profiles showed the presence of two phases of Co; FCC (γ-Co), and ΒCC phase of Co in addition to the presence of C in the graphite phase. The samples synthesized by processing at 1400°C showed only the FCC phase of Co whereas mixed phases of FCC and BCC Co were formed for samples heat treated at 1500°C. The magnetic properties were determined using VSM and FMR measurements. A magnetic saturation value of 160 emu/g was determined for the FCC phase which is consistent with the literature value. On the other hand, the magnetic saturation value of BCC Co was measured to be 214 emu/g. Magnetic data suggest the average magnetic moment is consistent with FCC cobalt. This simple method of producing BCC-Co has potential industrial and possible medical applications such as magnetic sensors, electromagnetic shielding, magnetic memory, magnetic fluids, magnetic composites and catalysis.