caa a22 4500 445380209 CHVBK 20180317143015.0 cr unu---uuuuu 170323e20111001xx s 000 0 eng 10.1007/s10948-011-1168-7 doi (NATIONALLICENCE)springer-10.1007/s10948-011-1168-7 Structural, Electrical and Dielectric Properties of Co-Mn Spinel Nanoferrites Prepared by Co-precipitation Technique [Elektronische Daten] [Tasawar Javed, Asghari Maqsood, Akhlaq Malik] Cobalt manganese nanoceramics with nominal composition Co1−x Mn x Fe2O4 (x=0.00, 0.15, 0.30, 0.45, 0.60, 0.75) were synthesized by a chemical coprecipitation technique. The X-ray diffraction patterns revealed the cubic spinel structure. The average crystallite size from the Sherrer formula was in the range of 28nm-56nm. The lattice parameter increased with a concentration of manganese. Scanning electron microscopy (SEM) was used for microstructural study. The electrical properties such as electrical resistivity (ρ), drift mobility (μ d), and activation energy (ΔE) were measured using a two-probe apparatus in the temperature range 323-573K. The electrical resistivity decreased with temperature and manganese concentration. The dielectric constant (ε′), loss factor or imaginary loss (ε″) and dielectric tangent loss (tan δ) were measured at room temperature using a LCR meter in the frequency range 100Hz to 5MHz. All the dielectric parameters decreased with increasing frequency. The AC electrical conductivity (σ ac) was calculated from the dielectric measurements. It increases with increase of frequency and manganese concentration. The increase in electrical conductivity may be attributed to the formation of Co+3 and Mn+3 from Co+2 and Mn+3, respectively, at both A and B sites. Springer Science+Business Media, LLC, 2011 AC conductivity nationallicence Coprecipitation nationallicence DC resistivity nationallicence Dielectric constant nationallicence Nanoceramics nationallicence Javed Tasawar Thermal Transport laboratory, School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST) H-12, Islamabad, Pakistan aut Maqsood Asghari Thermal Transport laboratory, School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST) H-12, Islamabad, Pakistan aut Malik Akhlaq Department of Metallurgical and Materials Engineering, University of Engineering and Technology (UET), Lahore, Pakistan aut Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/7(2011-10-01), 2137-2144 1557-1939 24:7<2137 2011 24 10948 https://doi.org/10.1007/s10948-011-1168-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10948-011-1168-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Javed Tasawar Thermal Transport laboratory, School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST) H-12, Islamabad, Pakistan aut NATIONALLICENCE 700 1- Maqsood Asghari Thermal Transport laboratory, School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST) H-12, Islamabad, Pakistan aut NATIONALLICENCE 700 1- Malik Akhlaq Department of Metallurgical and Materials Engineering, University of Engineering and Technology (UET), Lahore, Pakistan aut NATIONALLICENCE 773 0- Journal of Superconductivity and Novel Magnetism Springer US; http://www.springer-ny.com 24/7(2011-10-01), 2137-2144 1557-1939 24:7<2137 2011 24 10948 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer