Magnetic properties and formation of Sr ferrite nanoparticle and Zn,Ti/Ir substituted phases |
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| Institution: | 1. Department of Materials Science and Engineering, University of Science and Technology, Hefei 230039, China;2. Department of Physics, Anhui University, Hefei 230039, China;1. Groupe de Physique des Matériaux—UMR 6634 CNRS, Université et INSA de Rouen, Normandie Université, le Madrillet, 76800 St Etienne du Rouvray, France;2. University of Applied Sciences Jena, Department of SciTec, Carl-Zeiss-Promenade 2, 07745 Jena, Germany;3. Département GEII, Université de Cergy-Pontoise, 95031 Cergy-Pontoise, France;1. Center for Materials for Information Technology, The University of Alabama, Tuscaloosa, AL 35487, USA;2. Department of Chemical and Biological Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA;3. Department of Electrical and Computer Engineering, The University of Alabama, Tuscaloosa, AL 35487, USA;1. Department of Physics, Himachal Pradesh University, Shimla, India;2. School of Physics, Shoolini University, Bajhol, Solan, India;3. Department of Physics, IEC University, Atal Nagar, Kallujhanda, Baddi, India;4. Department of Physics, University of Aveiro, 3810-193 Aveiro, Portugal;5. King Abdullah Institute for Nanotechnology, King Saud University, Riyadh, Saudi Arabia;6. CSIR—National Physical Laboratory, Dr. K.S. Krishnan Marg, New Delhi 110012, India;1. Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences, Shenzhen 518055, China;2. Key Laboratory of Environmental Fracture (Ministry of Education), Institute of Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China;1. Institute for Advanced Materials, Jiangsu University, Zhenjiang 212013, China;2. College of Aerospace and Materials Engineering, National University of Defense Technology, Changsha 410073, China |
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| Abstract: | Strontium hexaferrite nanoparticles are prepared by the chemical sol–gel route. Specific saturation magnetization σs and coercive field strength Hc are determined depending on the heat treatment of the gel and iron/strontium ratio in the starting solution. These ultrafine powders with single-domain behavior have specific saturation magnetization σs=74 emu/g and coercive field strength Hc=6.4 kOe. Experimental results show that it is necessary to preheat the gel between 400 and 500°C for several hours . It can prevent the formation of intermediate γ-Fe2O3 and help to obtain ultrafine strontium ferrite single phase with narrow size distribution at a low annealing temperature. Additionally, the magnetic properties of sol–gel derived strontium ferrite with iron substituted by Zn2+, Ti4+ and Ir4+ are discussed. For an amount of substitution 0<x⩽0.6, the (Zn, Ti)x substituted strontium ferrite shows higher values of both coercive field strength and saturation magnetization than the (Zn, Ir)x substituted phase. |
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