Abstract
The nanocrystalline SrFe12 O 19 materials were prepared by a sol-gel auto-combustion method using different fuels such as citric acid, dextrose, aniline, and hexamine. The combustion product obtained from all the fuels except from that of aniline show a single phase of SrFe12 O 19 materials upon annealing at 1000 ∘C/2 h. The combustion product obtained from aniline as fuel shows SrFe12 O 19 as the main phase with α-Fe2 O 3 as impurity. No notable change in lattice parameters is observed due to variation in fuels for SrFe12 O 19 materials. With a little change in the NIR relative reflectance (72–85 %) on fuels, the different SrFe12 O 19 materials display high NIR reflectance in the wavelength range, 1500–2500 nm. The photoluminescence emission spectra of SrFe12 O 19 materials reveal a broad emission peak at ∼350 nm which is reminiscent to the Ba-based hexaferrite, BaFe12 O 19. The FESEM images expose quite dissimilar morphology for the various fuels used in the synthesis of SrFe12 O 19 materials. Hysteresis loops for all the nanocrystalline SrFe12 O 19 materials observed under the applied field of ±1.5 T at room temperature exhibit hard ferromagnetic property. The SrFe12 O 19 materials produced from glycine and aniline as fuels exhibit highest and lowest M s values of 61.3 and 50.5 emu/g, respectively.
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Acknowledgments
The authors, B. C. Brightlin (BCB) and S. Balamurugan (SB), are indebted to the Tamilnadu State Council for Science and Technology (TNSCST) (Ref.: AR/PS/2012-2013/209) for the partial support to the present work. The authors (BCB and SB) are thankful to V. Sherly Arputha Kiruba for her assistance in the sample preparation. Dr. K. Vinod, Low Temperature Studies Section, Condensed Matter Physics Division, Materials Science Group, Indira Gandhi Centre for Atomic Research, Kalpakkam, Tamil Nadu, 603102 India, is acknowledged for extending his help in VSM measurements. The authors (BCB and SB) would also like to extend their thanks to the Noorul Islam Centre for Higher Education for the encouragement and support.
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Brightlin, B.C., Balamurugan, S. & Arun, T. Microstructural and Magnetic Features of SrFe12 O 19 Materials Synthesized from Different Fuels by Sol-Gel Auto-Combustion Method. J Supercond Nov Magn 30, 1427–1437 (2017). https://doi.org/10.1007/s10948-016-3940-1
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DOI: https://doi.org/10.1007/s10948-016-3940-1