Investigation of sintered cobalt-zinc ferrite synthesized by coprecipitation at different temperatures: a relation between microstructure and hysteresis curves

Abstract

The magnetic properties of sintered samples of cobalt-zinc ferrites produced from the corresponding coprecipitate were calculated based on hysteresis curves (Hc). The Hc values confirmed that soft ferrites were obtained by the procedure. A possible relation between the magnetic hysteresis curves and the microstructure of the sintered samples was investigated. X ray diffraction, thermal analysis and scanning electron microscopy were used to characterize the microstructure and the phases present in the sintered ceramic pieces, as well as those of their coprecipitated tri-metallic hydroxide precursor powders. It was found that sintering of Co0.5Zn0.5Fe2O4 at 1400 °C led to "honeycombing" of the ferrite grains and that there was no single phase in the microstructure of a sample sintered at 1400 °C. Thus, a more complete study was made of the behavior of the microstructure at lower sintering temperatures, i.e., in the 1100-1350 °C range

Magnetic Spinel-Type CoFe2O4 Nanoparticles: Synthesis and Investigation of Structural, Morphological Properties

“…The DTA graph showed an exothermic reaction between 790 and 990 °C, which corresponded, on the TGA graph, to a 10.95 % weight loss. The reason for this weight loss was the presence of hydroxyl groups in the structure and this similar behavior was supported by literatures [23,24]. It was observed that if we do not implement calcination process, CoFe2O4 nanoparticles were not attracted by the magnet.…”

Microstructural and antibacterial properties of zinc-substituted cobalt ferrite nanopowders synthesized by sol-gel methods

“…There have been few reports that investigate the effect of zinc concentration on the microstructure and magnetic properties of zinc-substituted cobalt ferrite nanopowders. 20 One study found that the magnetic properties of a spinel were a)…”

Effects of Solvent Diols on the Synthesis of ZnFe2O4 Particles and Their Use as Heterogeneous Photo-Fenton Catalysts

“…ZnFe 2 O 4 particles have been prepared using various methods, such as co-precipitation [20,21], sol-gel [22], solid-state reaction [23], glycine combustion method [24], combustion reaction using urea as reducing agent [25,26], hydrothermal synthesis [27], solvothermal and microwave-assisted solvothermal synthesis [28], high enegy ball-milling [29], thermal plasma synthesis [30], one-step solid-phase chemical reaction [31], microwave combustion method [32], polyethylene glycol-assisted route [33] and synthesis in supercritical fluids [34,35]. Herein, we report the use of a solvothermal route for the preparation of ZnFe 2 O 4 particles.…”