Abstract
Ba0.5Sr0.5AlxFe12-xO19 was synthesized by systematically altering the Al-to-Fe content (x = 0, 1, 2, 3, 4) through the substitution of iron cations with an equivalent amount of aluminum cations. The powder was synthesized using the sol–gel auto-combustion method, resulting in a well-defined particle size distribution. This work aims to study the synthesis conditions for preparing barium strontium hexaferrite, and then the material properties was characterized by Thermogravimetric Analysis (TGA) and Differential Scanning Calorimetry (DSC), X-ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), and Vibrating Sample Magnetometer (VSM). The structure of the Al-substituted hexaferrite sample was confirmed using X-ray diffraction with the presence of a hexagonal phase. Using FESEM, the average particle size was found to be 76.35 nm. The magnetic properties of the barium strontium hexaferrite (BSFO) and the Al-substituted BSFO material were studied at room temperature using VSM by knowing the value of coercivity (Hc), saturation magnetization (Ms), retentivity (Mr), squareness ratio (Mr/Ms) for the permanent magnet application. The M-H loop and B-H loop provide insights into the ferromagnetic characteristics of the material. Additionally, the material is assessed to determine its maximum energy storage capacity, denoted as (BH)max. The coercivity of the material was increased from 5206 to 9189 Oe whereas, the saturation value decreased with the increase in the content of Al. The energy product (BH)max for pure BSFO was 13 kJ/m3 and this value were also estimated for different compositions of the material.
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Acknowledgements
The authors are thankful to the management, Vellore Institute of Technology, Vellore, Tamilnadu, India for their constant support and the characterization facilities provided for this work. We acknowledge the Nanotechnology Research Centre (NRC), SRMIST for providing the VSM facilities. The authors would like to express their gratitude to all the members of the laboratory as well.
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JM: investigation, writing—original draft. REV: supervision, writing—review & editing.
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Manoj, J., Vizhi, R.E. Effect of Al substitution on their structural and magnetic properties of Ba0.5Sr0.5Fe12O19 prepared via sol–gel auto-combustion method. J Mater Sci: Mater Electron 35, 370 (2024). https://doi.org/10.1007/s10854-024-12037-1
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DOI: https://doi.org/10.1007/s10854-024-12037-1