Elaboration and Experimental Investigation of Zn-Ni-Co Spinel Ferrite Multi-doped Rare-Earth (Gd, Er, and Sm) Prepared by Coprecipitation Method

The first structural, morphological and magnetic property studies on spinel nickel cobaltite nanoparticles synthesized from non-standard reagents

“…The first weight loss (B2.8%) occurs between 25 and 180 1C, which could be ascribed to the desorption of physically adsorbed water on the prepared powder. [37][38][39][40][41] The second weight loss (B5%) takes place between 220 and 350 1C, due to the CO 2 emission caused by the decomposition of cobalt carbonate to Co 3 O 4 (eqn (1)), and the dehydroxylation reaction of nickel hydroxide to produce the nickel oxide NiO (eqn (2)). 9,39,42 The third weight loss (B28%) occurs above 750 1C, which is attributed to melting of the salt, reduction of Co 3 O 4 to CoO (eqn (3)) and total decomposition of the NiCo 2 O 4 material resulting in the emergence of NiO.…”