The Ba(Sr)Mn2Fe16O27 w-type hexagonal ferrites as permanent magnets |
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| Institution: | 1. Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan;2. Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang, 321004, China;3. Nanotechnology Research and Application Center, Erciyes University, Kayseri, 38039, Turkey;4. Department of Physics, Bahawalnagar Campus, The Islamia University of Bahawalpur, Bahawalnagar, 62301, Pakistan;5. Department of Physics, College of Sciences, Princess Nourah bint Abdulrehman University (PNU), P.O. Box 84428, Riyadh, 11671, Saudi Arabia;6. Laboratoire de Microélectronique et Instrumentation (UR 03/13-04), Faculté des Sciences de Monastir, Avenue de l′Environnement, 5000 Monastir, Tunisia;7. Department of Physics, College of Science, Qassim University, P. O. 64, Buraidah, Saudi Arabia;8. Department of Physics, Government College University, Faisalabad, 38000, Pakistan;1. School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China;2. Dongyang Firstmagnet Company Limited, Dongyang 322105, China;1. Institute of Physics, The Islamia University of Bahawalpur, Bahawalpur, 63100, Pakistan;2. Department of Physics, Govt. S.E Graduate Collage Bahawalpur, Bahawalpur, 63100, Pakistan;3. Department of Physics & Centre for Nanoscience, University of Okara, Okara 56300, Pakistan;4. Department of Physics, University of Agriculture, Faisalabad, 38000, Pakistan;5. School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China;6. Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia;7. Dipartimento di Ingegneria dell’Innovazione, Università del Salento, via Monteroni, Lecce, 73100, Italy;8. School of Materials Science and Engineering, Yeungnam University, Gyeongsan, 712749, South Korea |
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| Abstract: | The BaMn2Fe16O27 and SrMn2Fe16O27 W-type hexagonal ferrites were prepared; these two compounds are ferrimagnetic (Tc = 424°C, 430°C) with a room temperature magnetization σ ≈ 75 emu/g. The influence of the milling and annealing treatments on the powder samples is studied: in the (700–1200°C) annealing temperature range, the decomposition of the W-phase occurs, leading to the presence of the M-phase and α-Fe2O3. Green compacts with or without extraneous phases were prepared by pressing the milled powders under a magnetic field. We give the variations of the density, the remanence and the coercive force as a function of the sintering temperature; the best values are obtained with the presence of the extraneous phases: d ≈ 5 g/cm3, Br ≈ 2500 G and HJc ≈ 3000 Oe. |
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