Enhanced magnetic properties of single domain Al-substituted strontium hexaferrite (SrFe12−xAlxO19) synthesized via hydrothermal method for permanent magnets

Al-substituted strontium hexaferrite (SrFe12–xAlxO19; x ≤ 2.0) materials were synthesized using the hydrothermal technique. The influence of the Al3+ substitution has been examined using the powder X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Field-emission scanning el...

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Bibliographic Details
Published in:Journal of alloys and compounds 2024-10, Vol.1001, p.175132, Article 175132
Main Authors: Dhingra, Anuja, Thakur, O.P., Pandey, Raghvendra
Format: Article
Language:English
Subjects:
Hydrothermal synthesis
Magnetic properties
Strontium hexaferrite
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Summary:Al-substituted strontium hexaferrite (SrFe12–xAlxO19; x ≤ 2.0) materials were synthesized using the hydrothermal technique. The influence of the Al3+ substitution has been examined using the powder X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FTIR), Field-emission scanning electron microscope (FE-SEM), and the vibrating sample magnetometry (VSM). Hexagonal phase formation with P63/mmc symmetry for all the compositions was confirmed by XRD study. With the increase of Al3+ concentration, lattice parameters gets contracted. Enhanced magnetic properties were observed in the Al-substituted strontium hexaferrite. The morphology of the undoped and doped samples were changed from irregular hexagonal flakes to plate-like (rod-like) shapes. In this study, the energy product (BH)max = 2.05 MGOe and squareness ratio (Mr/Ms) = 0.55 were obtained for an Al concentration of x = 1.5. The maximum value of the anisotropy constant (Keff) was 13.49×106 erg cm−3, for Al3+ doping content (x) = 1.5, which is tremendously high and possesses potential for its application as permanent magnets. [Display omitted] •Preparation of single domain SrFe12-xAlxO19 with x=0.0–2.0 using low temperature hydrothermal technique.•Determination of Saturation magnetization via Law of approach to Saturation.•Notable (BH)max of 2.045 MGOe is recorded for x=1.5 without any inclusion of rare-earth element.•Unprecedented anisotropy constant (13.49×105 J-m−3), magnetic hardness >1 and high squareness ratio (>0.54) suggests potential application in PMs.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2024.175132