Thermal and magnetic properties study of NiCo2O4/graphene and NiFe2O4/graphene

• Published in: Materials today : proceedings 2023, Vol.72, p.2921-2927
• Main Authors: George, Manuel, Pratheesh, K., Mohanty, Akash, Suresh, Nakul, Varghese, Tijo, Sunny, Richard, Narayanan, S.
• Format: Article
• Language: English
• Subjects: Graphene; Hummers method; Magnetic properties; Spinel ferrites
• ISSN: 2214-7853; 2214-7853
• DOI: 10.1016/j.matpr.2022.07.457

The article explores thermal stability studies and magnetization properties of spinel ferrites with graphene. Different spinel ferrites such as CoFe2O4, Ni0.25Zn0.75Fe2O4, NiFe2O4, NiCoFe2O4 were prepared by a co-precipitation method, followed by sintering at 900 °C, 1200 °C, 1450 °C, and graphene was prepared by Hummers method. The magnetic polarization after particle bonding was found higher for sintered powder samples. The saturation magnetization (Ms) of 50.57 emu/g for NiCoFe2O4 powder and 63.1 emu/g for CoFe2O4 specimen sintered at 1200 and 1400 °C. This could be by the weakening of spin canting with a variation in the increase of sintering temperature. The addition of graphene to nickel–cobalt improved the saturation magnetization from 40.8 to 43.8 emu/g with an increase in graphene content 5 to 20 wt%. An increase in magnetization of 6.8 % was gained by the influence of graphene. While nickel-ferrite with 26 mg graphene without sintering gained the Ms value as 30.79 emu/g. Thermal stability enhanced upon the increase in graphene concentration for NiCo and NiFe due to higher crystallite size as a higher stage 2 slope than stage 1 of DTG denoting a faster crystallite growth.