X-ray diffraction studies on aluminum-substituted barium hexaferrite |
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| Affiliation: | 1. Regional Research Laboratory (CSIR), Hydro and Electro Metallurgy Division, Bhubaneswar, 751 013, Orissa, India;2. Material Science Division, Department of Chemistry, Berhampur University, Berhampur 760 007, Orissa, India;1. Faculty of Mechanical Engineering, Department of Materials Science and Engineering, University of Tabriz, Tabriz, Iran;2. Research Laboratory of Polymer, Department of Organic and Biochemistry, Faculty of Chemistry, University of Tabriz, Iran;1. Department of Physics, Universitas Sumatera Utara, Medan 20155, Indonesia;2. Research Center for Physics, Indonesian Institute of Sciences (LIPI), Tangerang Selatan, Banten 15314, Indonesia;1. Synthèse et Structure des Nanomatériaux (UR11-ES30), Faculté des Sciences de Bizerte, Université de Carthage, 7021 Jarzouna, Tunisia;2. Université de Toulouse, LPCNO, UMR 5215 INSA-CNRS-UPS, 135 av. de Rangueil, 31077 Toulouse, France;3. Centre des Recherches et des Technologies de l''Energie Technopole, Laboratoires des Nanomatériaux et Systèmes des Energies Renouvelables, B.P N 95 2050, Hammam Lif, Tunisia;4. Department of Chemistry, College of Science, Imam Abdulrahman bin Faisal University, Dammam, Saudi Arabia;1. Department of Physics, Holy Cross College Nagercoil,Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli, India;2. Department of Physics, S.T. Hindu College Nagercoil, Manonmaniam Sundaranar University, Abishekapatti, Tirunelveli, India;1. Division of Materials Chemistry, Ruđer Bošković Institute, P.O. Box 180, HR-10002, Zagreb, Croatia;2. Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000, Zagreb, Croatia;3. University of Split, Faculty of Science, Department of Chemistry, R. Boškovića 33, 21000, Split, Croatia;4. Croatian Academy of Sciences and Arts, Trg Nikole Šubića Zrinskog 11, 10000, Zagreb, Croatia |
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| Abstract: | Effect of aluminum substitution in barium hexaferrite was studied following the hydrothermal precipitation–calcination techniques. It was attempted to prepare aluminum-substituted barium hexaferrites with compositions BaAlxFe12−xO19 having x=2,4, 6, 8 and 10. The precursors were prepared by using stoichiometric amounts of Ba, Al and Fe3+ nitrate solutions with urea as the precipitating agent. The hydrothermally prepared precursors were calcined at temperatures in the range of 800–1200 °C. The detailed work carried out on identification of crystalline phases through XRD revealed that, after the hydrothermal treatment, the samples showed barium carbonate, hematite and boehmite as the crystalline phases (except that boehmite was not identified for Ba/Al/Fe ratio as 1:2:10). Irrespective of the Al content, none of the 1000 and 1200 °C calcined samples showed any crystalline phase of Al. The 1200 °C calcined samples showed that Al-substituted barium hexaferrite is formed only with the Ba/Al/Fe atomic ratio of 1:2:10. With increase in the Al content, formation of hexaferrite was not observed. BaCO3 was found be present even at 1200 °C in all the samples except for the one having Fe/Al ratio 5. The normal decomposition temperature of BaCO3 is between 950 and 1050 °C. It is difficult to explain the increased stability of BaCO3, which is perhaps responsible for hindering the formation of aluminum-substituted barium ferrite having Fe/Al ratio ≤2. The Al substitution in barium hexaferrite was confirmed through magnetic measurements. |
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