Structural,dielectric and ferromagnetic behavior of (Zn,Co) co-doped SnO2 nanoparticles |
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| Affiliation: | 1. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China;2. Department of Physics, Abdul Wali Khan University Mardan, 23200 Khyber Pukhtunkhwa (KP), Pakistan;1. Laboratoire de Physico-Chimie des Matériaux Minéraux et leurs Applications, Centre National de Recherches en Sciences des Matériaux, B.P. 95 Hammam-Lif, 2050, Tunisia;2. Department of Physics, Sciences Faculty of Tunis, University Tunis El Manar, Tunis 2092, Tunisia;1. Department of Materials Engineering and Ceramic (CICECO), University of Aveiro, 3810-193 Aveiro, Portugal;2. TEMA-NRD, Mechanical Engineering Department and Aveiro Institute of Nanotechnology (AIN), University of Aveiro, 3810-193 Aveiro, Portugal;3. Center of Physics, University of Minho, Campus de Gualtar, 4710-057 Braga, Portugal;1. Department of Physics, Sri Venkateswara University, Tirupati -517502, A.P. India;2. Sir Vishveshwaraiah institute of Science and Technology, Angallu, Madanapalle, A.P. India;1. School of Mechanical Engineering, Yeungnam University, Gyeongsan 712-749, South Korea;2. Department of Electronics and Computer Engineering, Hanyang University, Seoul 133-791, South Korea;3. Department of Physics, Acharya Nagarjuna University, Guntur, A.P. 522510, India;1. Department of Applied Physics, Aligarh Muslim University, Aligarh-202002, India;2. Center of Nanotechnology, King Abdulaziz University, Jeddah-21589, Saudi Arabia |
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| Abstract: | Nanoparticles of basic composition Sn0.94Zn0.05Co0.01O2, Sn0.92Zn0.05Co0.03O2 and Sn0.90Zn0.05Co0.05O2 were synthesized by chemical precipitation method. The incorporation of Co and Zn in SnO2 lattice introduced significant changes in the physical properties of all the three nanocrystals. The average particle size estimated from TEM data decreased from 15.71 to 6.41 nm with enhancement in concentration of oxygen vacancies as Co content is increased from 1 to 5 wt%. Increasing Co content enhanced the Sn:O atomic ratio as a result concentration of oxygen vacancies increased. The dielectric study revealed strong doping dependence. The dielectric parameters (ε′, tanδ and σac) increased with increasing Co content and attained maximum values for 5% (Zn, Co) co-doped SnO2 nanoparticles. The dielectric loss (ε′′) exhibited dispersion behavior and the Debye’s relaxation peaks observed in dielectric loss factor (tanδ), whose intensities increased with increasing Co content. The variation of dielectric properties and ac conductivity revealed that the dispersion is due to Maxwell-Wagner interfacial polarization and hopping of charge carriers between Sn+2/Sn+3 and Co+2/Co+3. The large dielectric constant of all samples made them interesting materials for device application. Magnetization measurements (M (H) loops) revealed enhancement in saturation magnetization with doping which is due to the formation of large amount of induced defects and oxygen vacancies in the samples. The present study clearly reveals doping dependent properties and the oxygen vacancies induced ferromagnetism in Zn, Co co-doped SnO2 nanoparticles having applications in ultra-high dielectric materials, high frequency devices and spintronics. |
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| Keywords: | Crystallite Nanoparticles Defects Dielectric properties Magnetic properties |
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