naa a22 4500 510801188 CHVBK 20180411083356.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11664-013-2656-2 doi (NATIONALLICENCE)springer-10.1007/s11664-013-2656-2 An Approach for Enhancement of Saturation Magnetization in Cobalt Ferrite Nanoparticles by Incorporation of Terbium Cation [Elektronische Daten] [Tahmineh Sodaee, Ali Ghasemi, Ebrahim Paimozd, Andrea Paesano Jr., Akimitsu Morisako] Cobalt ferrite nanoparticles were synthesized by a reverse micelle process. The optimum processing conditions required to fabricate nanocrystalline cobalt ferrite using a reverse micelle technique, especially the effect of water-to-surfactant molar ratios including w=8, 10, 12, and 14, pH values in the range of 8 to 11, and annealing temperatures in the range of 400°C to 800°C, were evaluated. x-Ray diffraction (XRD), field-emission scanning electron microscopy (FE-SEM), vibrating-sample magnetometry, and superconducting quantum interference device analysis were employed to evaluate the structural and magnetic properties of synthesized nanoparticles. XRD analysis confirms that the nanoparticles have a single-phase cubic spinel structure. The average particle size increases with increasing pH value and annealing temperature. Magnetization study reveals that the cobalt ferrite nanoparticles exhibit a superparamagnetic trend. The zero-field-cooled magnetization curves of cobalt ferrite nanoparticles indicated that, with an increase in pH value, the blocking temperature increases. Based on the obtained optimum parameters, terbium-substituted cobalt ferrite nanoparticles with composition CoFe2−x Tb x O4 (x=0.1 to 0.5) were prepared by a reverse micelle process. XRD and field-emission scanning electron microscopy evaluation demonstrated that single-phase spinel ferrites with narrow size distribution were obtained. Mössbauer spectroscopy was used to determine the site preference of terbium cation. The results confirm that terbium cations were distributed at tetrahedral and octahedral sites, but with a preference for the former. It was observed that, with an increase in terbium content, the saturation magnetization increases. TMS, 2013 Cobalt ferrite nationallicence terbium cations nationallicence magnetic properties nationallicence reverse micelle nationallicence Sodaee Tahmineh Materials Engineering Department, Malek-Ashtar University of Technology, Shahin Shahr, Iran aut Ghasemi Ali Materials Engineering Department, Malek-Ashtar University of Technology, Shahin Shahr, Iran aut Paimozd Ebrahim Materials Engineering Department, Malek-Ashtar University of Technology, Shahin Shahr, Iran aut Paesano Jr. Andrea Centro de Ciências Exatas, Departmento de Física, Universidade Estadual de Maringá, Maringá, Brazil aut Morisako Akimitsu Spin Device Technology Center, Faculty of Engineering, Shinshu University, 380-8553, Nagano, Japan aut Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/9(2013-09-01), 2771-2783 0361-5235 42:9<2771 2013 42 11664 https://doi.org/10.1007/s11664-013-2656-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11664-013-2656-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sodaee Tahmineh Materials Engineering Department, Malek-Ashtar University of Technology, Shahin Shahr, Iran aut NATIONALLICENCE 700 1- Ghasemi Ali Materials Engineering Department, Malek-Ashtar University of Technology, Shahin Shahr, Iran aut NATIONALLICENCE 700 1- Paimozd Ebrahim Materials Engineering Department, Malek-Ashtar University of Technology, Shahin Shahr, Iran aut NATIONALLICENCE 700 1- Paesano Jr Andrea Centro de Ciências Exatas, Departmento de Física, Universidade Estadual de Maringá, Maringá, Brazil aut NATIONALLICENCE 700 1- Morisako Akimitsu Spin Device Technology Center, Faculty of Engineering, Shinshu University, 380-8553, Nagano, Japan aut NATIONALLICENCE 773 0- Journal of Electronic Materials Springer US; http://www.springer-ny.com 42/9(2013-09-01), 2771-2783 0361-5235 42:9<2771 2013 42 11664 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer