Effect of Reaction Time on the Coercivity of Barium Ferrite Synthesized by Hydrothermal Process

Abstract

The barium ferrite BaFe12O19 with c-plane anisotropy, which possessed relative high saturation magnetization and low coercivity, had been synthesized by hydrothermal method with different reaction time of 5 h, 8 h,11 h,14 h, and 17 h. The X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and vibrating sample magnetometer (VSM) were used to study the phase composition, microstructure and magnetic properties of barium ferrite, respectively. The results showed the intensities of the peak were enhanced and there was no impurity phase. With the prolonging of the reaction time to 11 h, 14 h and 17 h, the grain size increased, and the equivalent diameter was about 1 μm, and the thickness was about 100 nm. When the reaction time was 17 h，the coercivity of barium ferrite was 1104 Oe. The reduction of coercivity was ascribed to the increase of particle size and the reduction in magnetic anisotropy.

Structural, Electrical and Magnetic Properties of Zn Doped NiFe2O4 Added with 0.8wt%V2O5 Synthesized via Ceramic Method

“…Various synthesis methods have been designed for research and commercial purposes in order to improve the performance chart, achieve new results, and fulfil the application pyramid of these ferrites. Some of the special synthesis methods are sol-gel autocombustion [15], electro-deposition method [16], co-precipitation method [17], micro-emulsion [18], auto-clave method [19], salt-melt technique [20], spray pyrolysis [21], solid-state reaction method [22], and so on. The term 'additive' refers to a material that is mixed with another substance.…”

Investigation of Magnetic Phase Formation in Nickel-Zinc Ferrites by X-Ray Diffraction and Thermal Analysis

“…There are several methods to produce ferrites powders with ultra-and nanoparticles: sol-gel [13,14], hydrothermal synthesis [15] and chemical combustion route [16,17]. Here, to obtain ferrites of a single phase composition, repeated calcinations are often required, which leads to the formation of large particles.…”