Influence of the Mole Ratio, Sintering Condition and Particle Size on the Magnetic Properties of BaFe₁₂O₁₉ Synthesized by Ceramic Method

Abstract

Barium ferrite (BaFe12O19) with different particle sizes were successfully synthesized by solid‐state reaction (ceramic method) using locally available low cost α‐Fe2O3 mixed with BaO2. The prepared samples were sintered in the temperature range of 950° to 1200°C for 1.5 to 6 h. The prepared products of barium ferrite were characterized by X‐ray diffraction, a scanning electron microscope, and a vibrating sample magnetometer. The effect of mole ratio, sintering temperature, and time was studied. A further addition of 10% BaO2 to the mole ratio (BaO2:5.7Fe2O3), and removing the particle size <63 μm, exhibits a pure phase BaFe12O19. The saturation magnetization reached the optimum value of Ms=∼67 emu/g with coercivity of 2596 Oe, under sintering temperature up to 1100°C for 4.5 h.

Influence of calcination temperature on structure and multiferroic properties of barium ferrite ceramics

“…Residual magnetization, saturation magnetization and coercive magnetic fields of the A1, A2 and A3 samples are 36.1, 38.9, 47.4 emu/g; 65.7, 71.3, 80.0 emu/g and 4108.9, 4445.1, 1991.4 Oe, respectively. This is similar to the previously reported studies [49][50][51]. The saturation magnetization and residual magnetization of the prepared ceramics increase with increasing the powder calcination temperature.…”

Investigation into the structural features and microwave absorption of doped barium hexaferrites

“…[4][5][6] is explained also by their good functional properties. 7 Their excellent chemical stability and corrosion resistance 8 make them ecologically safe and suitable for applications, practically without time restrictions. The combination of high coercive force (H c ∼ 160-55 kA m −1 ) with rather high residual induction allows them to be used as permanent magnets with satisfactory specific magnetic energy.…”

Achieving Superior Electromagnetic-Absorbing Performances in the Hexagonal Flake BaFe12O19@PVDF Composites

“…As shown in Figure , the saturation magnetization ( M s ) value of BaFe 12 O 19 is 24.29 emu/g, and the coercivity ( H C ) is 760.36 Oe, respectively. Grain size is an important factor influencing H C and M s , and larger grain sizes result in higher saturation magnetization. − The hydrothermal synthesis of BaFe 12 O 19 is usually carried out under low temperatures (220 °C) and high-pressure reaction conditions without calcining the powder. In contrast, the traditional BaFe 12 O 19 synthesis method requires a high temperature ( T > 1000 °C) to calcine the powders, whereas the hydrothermal method produces smaller-sized BaFe 12 O 19 particles. , Smaller particles provide a greater surface area, which increases the magnetic exchange interactions between particles, thereby reducing coercivity.…”