Controlling the structural, microstructure and magnetic properties of barium W-type hexaferrite elaborated using tartari
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Controlling the structural, microstructure and magnetic properties of barium W-type hexaferrite elaborated using tartaric acid precursor strategy M. M. Hessien1,2 · D. A. Rayan2 · M. H. H. Mahmoud1,2 · A. Alhadhrami1 · M. M. Rashad2 Received: 13 February 2018 / Accepted: 29 March 2018 © Springer Science+Business Media, LLC, part of Springer Nature 2018
Abstract In this study, barium W-type hexaferrite (BaCo2Fe16O27) nanopowders have purposefully fabricated through tartaric acid precursor method using inexpensive starting materials. In this regards, the impact of the synthesis conditions namely the annealing temperature and the Ba:Co molar ratio on the crystal structure, crystallite size, microstructure and magnetic structure was explored using X-ray diffraction, scanning electron microscopy and vibrating sample magnetometer. For instance, well crystalline W-type hexaferrite was realized for the precursors annealed at a low temperature of 1100 °C for 2 h using two different Ba:Co molar ratios of 1.1:2.2 and 1.2:2.4. The crystallite size, the lattice constant, the aspect ratio as well as the unit cell volume were substantially affected with the Ba:Co molar ratio and the annealing temperature. Remarkably, the morphology of hexaferrite powders can be controlled by adjusting the annealing temperature and the Ba:Co molar ratio. Clearly, the microstructure of the formed powders was improved to a hexagonal platelet-like structure by raising the annealing temperature. Eventually, maximum saturation magnetization Ms = 72.3 emu/g was accomplished for W-hexaferrite particles obtained with Ba:Co molar ratio 1.1:2.2 annealed at 1350 °C for 2 h. Wide coercivities (196–1097 Oe) were achieved at the different synthesis conditions.
1 Introduction To date, the applications of electromagnetic (EM) wave in the high GHz ranges include the wireless telecommunication systems, radar, local area network as well as the medical equipment, etc have considerable awareness [1]. In this regards, electromagnetic interference (EMI) has been a significant issue related to the explosive growth in the utilization of the electrical and the electronic devices in industrial, commercial, and militaristic applications [2, 3]. Accordingly, ferrites nanoparticles provide as a superior electromagnetic interference (EMI) suppressors imputed to their dielectric counterparts based on their excellent magnetic properties. Among them, hexaferrites types have become very substantial materials commercially and technologically with the * M. M. Rashad [email protected] 1
Department of Chemistry, Faculty of Science, Taif University, Hawiya, P.O. Box: 888, Taif, Saudi Arabia
Central Metallurgical Research and Development Institute (CMRDI), P.O. Box: 87, Helwan 11421, Cairo, Egypt
2
plurality of uses and applications The magnetic properties of ferrites are joined by the structure and the microstructure of the powders [4–6]. In this context, there are six possible different types designated M, U, W, Y, X and Z substantial of hexagonal ferrites, which are abs
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