Magnetic, Micro-structural, and Optical Properties of Hexaferrite, BaFe₁₂O₁₉ Materials Synthesized by Salt Flux-Assisted Method

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• 作者：B. C. Brightlin ; S. Balamurugan
• 关键词：Hexaferrite ; BaFe12O19 ; Molten salt flux ; Magnetic properties ; Optical properties ; Morphology
• 刊名：Journal of Superconductivity and Novel Magnetism
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：30
• 期：1
• 页码：215-225
• 全文大小：
• 刊物类别：Physics and Astronomy
• 刊物主题：Strongly Correlated Systems, Superconductivity; Magnetism, Magnetic Materials; Condensed Matter Physics; Characterization and Evaluation of Materials;
• 出版者：Springer US
• ISSN：1557-1947
• 卷排序：30

文摘

This paper reports the eco-friendly synthesized BaFe₁₂O₁₉ phase materials by a molten salt flux approach and their experimental findings. The reaction mixture (BaCO₃ and Fe₂O₃) annealed with the mixture of salt (NaCl:KCl) flux yielded good quality nanocrystalline hexagonal ferrite BaFe₁₂O₁₉ phase materials. The plate-like hexagonal-shaped BaFe₁₂O₁₉ phase morphology with random particle sizes of ∼370 to 940 nm is seen for the good quality flux-annealed sample. The room-temperature magnetic hysteresis loop of the BaFe₁₂O₁₉ sample exhibits hard ferromagnetic saturation magnetization (M_s) of 50.23 emu/g at 15 kOe, and coercive field (H_c) is 3500 Oe. The determined energy bandgap (E_g) is found to be 3.58 eV for the BaFe₁₂O₁₉ phase material. The Fourier transform infrared (FT-IR) spectral features confirm the presence of Fe–O and Ba–O bonds in the flux-synthesized BaFe₁₂O₁₉ materials. The photoluminescence (PL) emission peak (∼360 nm) intensity of BaFe₁₂O₁₉ materials varies regardless of annealing temperatures. The different salt flux-synthesized BaFe₁₂O₁₉ materials appear as brown- and dark gray-colored powders that can be applied as a ceramic color pigment due to its high NIR reflectivity.