caa a22 4500 463228847 CHVBK 20180405153235.0 cr unu---uuuuu 170326e20070901xx s 000 0 eng 10.1007/s10853-006-1251-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1251-9 The influence of the segregation of Cu-rich phase on the microstructural and impedance characteristics of CaCu3Ti4O12 ceramics [Elektronische Daten] [B. Shri Prakash, K. Varma] The influence of sintering conditions on the microstructural features and impedance characteristics of the giant dielectric constant material CaCu3Ti4O12 (CCTO) was investigated. The microstructure and impedance characteristics were found to be strongly dependent on the sintering conditions. Sintering of the CCTO ceramics at elevated temperatures (>1100°C) for prolonged durations resulted in the segregation of Cu-rich phase, mostly confined to the surface, which was in concomitance with the appearance of the additional semicircle at the low frequency end in Impedance (Z*) plots. The absence of this additional semicircle in the Cu-deficient CCTO ceramics and the appearance of the same in Cu-rich CCTO ceramics that were deliberately fabricated corroborated the above observations. Also, La2/3Cu3Ti4O12 (LCTO), a low dielectric constant member of CCTO family, which consisted of small grains without the segregation of Cu-rich phase at the grain boundary, did not reveal the presence of additional semicircle in the Z*plots. Springer Science+Business Media, LLC, 2007 Shri Prakash B. Materials Research Centre, Indian Institute of Science, 560012, Bangalore, India aut Varma K. Materials Research Centre, Indian Institute of Science, 560012, Bangalore, India aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7467-7477 0022-2461 42:17<7467 2007 42 10853 https://doi.org/10.1007/s10853-006-1251-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1251-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shri Prakash B. Materials Research Centre, Indian Institute of Science, 560012, Bangalore, India aut NATIONALLICENCE 700 1- Varma K. Materials Research Centre, Indian Institute of Science, 560012, Bangalore, India aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/17(2007-09-01), 7467-7477 0022-2461 42:17<7467 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer