caa a22 4500 463223160 CHVBK 20180405153218.0 cr unu---uuuuu 170326e20070301xx s 000 0 eng 10.1007/s10853-006-1058-8 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1058-8 Compositional analysis and electrical properties of Sb, Mn-doped barium strontium titanate PTCR ceramics with TiO2 and SiO2 sintering additives [Elektronische Daten] [P. Bomlai, N. Sirikulrat, A. Brown, E. Condliffe, S. Milne] The secondary phase compositions in Sb-doped (Ba, Sr)TiO3 ceramics containing SiO2 and excess TiO2 sintering additives have been examined by XRD, BEI and EPMA techniques. It is shown that alongside the primary (Ba0.797Sr0.2Sb0.003)TiO3 phase, (Ba1.95Sr0.05)2(Ti1.2Si1.8)O8 and Sb-doped (Ba0.99Sr0.01)6Ti17O40 phases form at the intergranular regions. Substitution of up to 0.04mol% MnO2 enhances the PTCR effect, giving a ratio ρmax/ρmin∼7×105 for the optimum 0.04% MnO2 composition. At this level Mn cannot be detected in the microstructure by EPMA, however in insulating samples containing 0.08mol% of MnO2, it was detected in the (Ba0.99Sr0.01)6Ti17O40 intergranular phase. Springer Science+Business Media, LLC, 2007 Bomlai P. Materials Science Program, Faculty of Science, Prince of Songkla University, 90112, Songkhla, Thailand aut Sirikulrat N. Department of Physics, Faculty of Science, Chiang Mai University, 50200, Chiang Mai, Thailand aut Brown A. Institute for Materials Research, University of Leeds, LS2 9JT, Leeds, UK aut Condliffe E. School of Earth and Environment, University of Leeds, LS2 9JT, Leeds, UK aut Milne S. Institute for Materials Research, University of Leeds, LS2 9JT, Leeds, UK aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 2175-2180 0022-2461 42:6<2175 2007 42 10853 https://doi.org/10.1007/s10853-006-1058-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1058-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bomlai P. Materials Science Program, Faculty of Science, Prince of Songkla University, 90112, Songkhla, Thailand aut NATIONALLICENCE 700 1- Sirikulrat N. Department of Physics, Faculty of Science, Chiang Mai University, 50200, Chiang Mai, Thailand aut NATIONALLICENCE 700 1- Brown A. Institute for Materials Research, University of Leeds, LS2 9JT, Leeds, UK aut NATIONALLICENCE 700 1- Condliffe E. School of Earth and Environment, University of Leeds, LS2 9JT, Leeds, UK aut NATIONALLICENCE 700 1- Milne S. Institute for Materials Research, University of Leeds, LS2 9JT, Leeds, UK aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/6(2007-03-01), 2175-2180 0022-2461 42:6<2175 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer