Synthesis of Co-Zr doped nanocrystalline strontium hexaferrites by sol-gel auto-combustion route using sucrose as fuel and study of their structural,magnetic and electrical properties |
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| Affiliation: | 1. Department of Chemistry, Centre for Advanced Studies-I, Guru Nanak Dev University, Amritsar 143005, India;2. Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India;3. Department of Electronics Technology, Guru Nanak Dev University, Amritsar 143005, India;1. Department of Physics Fatih University, 34500 B. Çekmece, Istanbul, Turkey;2. Department of Chemistry, Fatih University, 34500 B. Çekmece, Istanbul, Turkey;3. TUBITAK-UME, National Metrology Institute, 41470 Gebze, Kocaeli, Turkey;1. School of Physics & Materials Science, Shoolini University, Solan 173211, India;2. Himalayan Centre of Excellence in Nanotechnology, Shoolini University, Solan 173212, India;3. Nanotechnology Wing, Innovative Science Research Society, Shimla 171001, India;4. Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India;5. Laboratoire des Sciences et Techniques, de l’Information, de la Communication et de la Connaissance, UMR CNRS 6285, 6 av. Le Gorgeu, CS 93837, 29238 Brest Cedex 3, France;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. Department of Chemistry, Fatih University, 34500 B.Çekmece-Istanbul, Turkey;2. Department of Software Engineering, Istanbul Sabahattin Zaim University, Halkali Cad., 34303 K.Çekmece-Istanbul, Turkey;3. Department of Physics, Hitit University, 19030 Çevre Yolu Bulvarı-Çorum, Turkey;4. Spin Device Technology Center, Faculty of Engineering, Shinshu University, 380-8553 Nagano, Japan;1. Department of Chemistry, Sule Lamido University, P.M.B 048, Kafin Hausa, Jigawa State, Nigeria;2. Department of Chemistry, Fatih University, B.Çekmece, 34500 Istanbul, Turkey;3. Department of Physics, Fatih University, B.Çekmece, 34500 Istanbul, Turkey;4. TUBITAK-UME, National Metrology Institute, 41470 Gebze, Kocaeli, Turkey;1. Department of Chemistry, Fatih University, 34500 B. Çekmece, İstanbul, Turkey;2. Department of Physics, Hitit University, 19030 Çevre Yolu Bulvarı, Çorum, Turkey;3. Department of Physics, Fatih University, 34500 B. Çekmece, İstanbul, Turkey;4. Spin Device Technology Center, Faculty of Engineering, Shinshu University, 380-8553 Nagano, Japan;5. Department of Physics Engineering, Istanbul Technical University, 34469 Maslak, Turkey |
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| Abstract: | Sol-gel auto-combustion route using sucrose as fuel has been employed to synthesize nanocrystalline particles of SrZrxCoxFe(12−2x)O19 (0.0≤ x ≤1.0). The characterization of these materials has been done by TGA-DTA, FT-IR, XRD and EDS. SEM and TEM techniques have been used to study the structure and morphology. Magnetic properties have been investigated by VSM and Mössbauer spectroscopy (MS). The influence of calcination temperature on morphology and magnetic properties of samples is studied in a wide temperature range of 500–1100 °C. XRD analysis indicates the formation of pure single phase hexagonal ferrites at 900 °C. The crystallite size calculated using Scherrer equation lies in a narrow range of 21–33 nm. The crystallite size is small enough to obtain a suitable signal to noise ratio in high density recording medium. Substitution of Zr and Co for Fe has been found to have a profound effect on the structural, magnetic and electrical properties. Upon substitution saturation magnetization (MS) first increases from 62.67 emu/g to 64.84 emu/g (up to x=0.4) followed by a decrease to 49.71 emu/g at x=1.0. There is a slow fall in coercivity (HC) from 5785.74 (x=0.0) to 1796.51 Oe (x=1.0). Dielectric constant, dielectric loss tangent and AC conductivity in the frequency range 20 Hz to 120 MHz have been studied for all the compositions (x=0–1.0). The composition and frequency dependence of these dielectric parameters has been qualitatively explained. |
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| Keywords: | Strontium hexaferrite Sucrose Sol-gel Magnetic properties Nanoparticles Dielectric constant |
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