Study of physical and magnetic properties of Mg:Co3O4 spinels using L-Arginine as fuel
M. Sundararajan, J. Vidhya, R. Revathi, M. Sukumar, V. Ravi, R. Rajkumar, M. Kamalakannan, Chandra Sekhar Dash, H. Lohedan, R. Jothi Ramalingam, Selvaraj Arokiyaraj
Abstract
Magnesium doped cobalt oxide nanoparticles were synthesized via microwave assisted combustion method (MACM). The X-ray diffraction (XRD) patterns of pure Co3O4 and Mg2+ doped Co3O4(x = 0.1 and 0.3) confirmed the cubic spinel structure and without any additional impurity peaks. However, doping Mg2+ concentration, x = 0.3 and 0.5 sample was occur a new hexagonal phase, while the average crystallite size of the cubic spinel structure in the range from 48.5 nm to 15.5 nm. The FT-IR bands at 661 and 573 cm−1 are attributed to the Co–Ostretching mode of cubic spinel Co3O4 structure. The band gap calculated using Kubelka–Munk (K–M) technique and increasedband gap values withthe increase in Mg2+ content (1.87–3.60 eV), due to the causes of sub-bands in the energy band gap. The morphological study revealed the prepared samples exhibited intragranular pores and merged grains with discrete grain boundaries.Magnetization analysis revealed the appearance of para-/superpara- magnetic behavior at ±15KOe.