Molten Salt Synthesis and Magnetic Properties of BaFe12O19 Hexaferrite

doi:10.3724/SP.J.1077.2011.00792

Abstract

Abstract: Barium ferrite BaFe₁₂O₁₉ (BaM) powders were prepared by using molten salt method. The preparation conditions of samples were investigated in detail, such as annealing temperature, soaking time, molten salt additive amount and Fe³⁺/Ba²⁺ molar ratios. The phase composition, microstructure and magnetic properties of the resultant powders were measured respectively by X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM) and Vibrating Sample Magnetometer (VSM). Formation of BaM started below 750℃ in 0.5NaCl+0.5KCl. Single phase BaM powders were obtained while the Fe³⁺/Ba²⁺ molar ratios was controlled in the range from 10 to 11.5. The SEM results showed that the grains were regular hexagonal platelets when molten salt additive amount R was controlled in the range from 1 to 3. The resultant powders achieved under condition of Fe³⁺/Ba²⁺ molar ratios of 11.5 and calcination temperature of 1000℃ showed the saturation magnetization up to 71.9A·m²/kg, which was quite close to the theoretical value of 72A·m²/kg.

Key words: molten salt synthesis, BaFe₁₂O₁₉, hexaferrite, magnetic property

CLC Number:

O482

LI Hai-Feng, GONG Rong-Zhou, LU Xiu-Fang, YU Wei, WANG Xian, FAN Li-Ren1, He Gang. Molten Salt Synthesis and Magnetic Properties of BaFe₁₂O₁₉ Hexaferrite[J]. Journal of Inorganic Materials, 2011, 26(8): 792-796.

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Molten Salt Synthesis and Magnetic Properties of BaFe₁₂O₁₉ Hexaferrite

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