caa a22 4500 463223233 CHVBK 20180405153219.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-0003-1 doi (NATIONALLICENCE)springer-10.1007/s10853-006-0003-1 Ac conductivity, dielectric losses, permittivity behavior of Ba x Sr1− x Fe0.8Co0.2O3−δ ( x =0, 0.5 and 1) ceramics [Elektronische Daten] [Sandeep Singh, Jitendra Kumar] In this paper, we have investigated ac conductivity, dielectric losses, permittivity of Ba x Sr1−x Fe0.8Co0.2O3−δ (x=0, 0.5, 1) ceramics. It has been observed that increase in barium content decreases activation energy (i.e. conductivity increases) in the higher temperature region (550-770K). In the lower temperature region system with x=0 shows metallic conductor behavior and system with x=1 shows thermally activated behavior. The ferroelectric peak temperatures are observed at 700, 750 and 723K for x=0, 0.5 and 1, respectively. This peak temperature can be attributed to the oxygen-vacancy-related dielectric relaxation. With the increase of barium content the dielectric dispersion tend to diminishes. Partial substitution of strontium with barium (for x=0.5) reduces dielectric losses by 50%. Springer Science+Business Media, Inc., 2007 Singh Sandeep Department of Chemical and Materials Engineering, University of Cincinnati, 45221, Cincinnati, OH, USA aut Kumar Jitendra Materials Science Programme, Indian Institute of Technology, 208016, Kanpur, India aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 2105-2111 0022-2461 42:6<2105 2007 42 10853 https://doi.org/10.1007/s10853-006-0003-1 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-0003-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Singh Sandeep Department of Chemical and Materials Engineering, University of Cincinnati, 45221, Cincinnati, OH, USA aut NATIONALLICENCE 700 1- Kumar Jitendra Materials Science Programme, Indian Institute of Technology, 208016, Kanpur, India aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 2105-2111 0022-2461 42:6<2105 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer