The role of flash auto-combustion method and Mn doping in improving dielectric and magnetic properties of CoFe2O4

Abstract

In this work, we prepared Co 1-x Mn x Fe 2 O 4 (CMFO) ferrites at different levels of doping x = 0.0, 0.1, 0.3, 0.5 and 0.7 using flash auto-combustion method, aiming to obtain promising results more than CoFe 2 O 4 ferrite prepared by other methods. The results show an increase in lattice constant of CMFO with Mn content. In addition, there are many intra-granular pores and significant fusion of the small grains into larger grains. The dielectric properties of CMFO ferrites are enhanced with Mn content. Furthermore, saturation magnetization (M S ) and remanent magnetization (M r ) of CMFO are improved slightly with Mn content up to x = 0.1 and then decrease with higher Mn content. The coercivity (H C ) of CMFO ferrite decreases with Mn content until it reaches minimum value of 971 Oe for level of Mn substitution x = 0.5; on further Mn content (X = 0.7), it is observed that H c increases to 1249 Oe. In comparison to previous works, H C (x = 0) and M S and M r for our sample (x = 0.1) are significantly more than corresponding values obtained for CoFe 2 O 4 ferrite prepared by other methods.

Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites

“…An unexpected result was that the synthesized composite with 6 wt.% Mg 0.8 Zn 0.2 Fe 1.5 Al 0.5 O 4 had a low coefficient of friction in comparison with similar composites due to the successfully combined effect of microstructure (low roughness) and low surface energy. The flash auto-combustion method [61,62] was used for the spinel ferrite nanoparticle preparation. Spinel ferrite has the formula Mg 0.8 Zn 0.2 Fe 1.5 A l0.5 O 4 (MZFA).…”

Low Temperature Chemical Synthesis and Investigation of Cadmium Substituted of Structural Properties of Cobalt Nano Ferrites

“…In cadmium substituted cobalt ferrites, the non-magnetic ion like, Cd 2+ instead of magnetic cobalt ion offer inventive changes in their magnetic properties. The number of fabrication methods have been used for the synthesis of ferrite nanoparticles such as solid state reaction [40], co-precipitation method [41], ceramic method [42], sol-gel method [43], thermal decomposition technique [44], hydrothermal method [45], flash-combustion method [46] etc., The co-precipitation method is a high quality synthetic root for preparation of cobalt ferrite nanoparticles. As indicated by the literature review, some unique properties of co-precipitation method such as high yield with better purity, low cost, production of fine particles with high surface area make it more prominent that others [47][48][49].…”

Study of the Structural and Magnetic Properties of a Novel Cola/Lah Nanocomposite Material

“…One of these is the flash auto-combustion technique, which has been used in the current study because it is easy, quick, cost-effective, and saves time, and has piqued the interest of various researchers. [21][22][23][24][25][26][27][28][29] Researchers have developed a wide range of nanocomposite materials by incorporating cobalt nanoferrite with other materials for a wide range of uses. 20 However, to the best of the authors' knowledge, this is the first time a nanocomposite of CoLa nanoferrite has been prepared with hematite.…”