caa a22 4500 463233980 CHVBK 20180405153251.0 cr unu---uuuuu 170326e20070601xx s 000 0 eng 10.1007/s10853-006-1404-x doi (NATIONALLICENCE)springer-10.1007/s10853-006-1404-x Investigations on surface composition and microstructure of sintered barium titanate [Elektronische Daten] [Sanjiv Kumar, V. Raju, T. Kutty] The paper describes studies on surface atomic composition, microstructure and microarea elemental distribution in sintered undoped as well as donor or acceptor doped polycrystalline barium titanate ceramics. The specimens examined are derived from barium titanate powders synthesized by two different wet chemical procedures namely oxalate precursor route and gel-to-crystallite conversion. The compositional analysis is carried out by backscattering spectrometry (BS) involving 3.05MeV 16O(α,α)16O resonant scattering while investigations on microstructure and microarea elemental distribution are performed using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The specimens prepared by either method are monophasic; however, their surface atomic composition, microstructural features as well as electrical characteristics are significantly different. The specimens obtained by oxalate precursor route generally have Ti rich surfaces and exhibit coarse to fine grained microstructure depending on the nature and extent of doping. The Mn-doped specimens exhibit appreciable O deficiency. The specimens prepared by gel to crystallite conversion, in contrast, usually have Ba enriched surfaces and exhibit fine-grained microstructure. EDS measurements show the segregation of acceptors such as Mn, Cu and Zn in the grain boundaries of oxalate precursor derived ceramics. Further, the relative atomic ratio of Ti to Ba at the sites of segregations is higher compared to other locations. Springer Science+Business Media, LLC, 2007 Kumar Sanjiv National Centre for Compositional Characterization of Materials, Bhabha Atomic Research Centre, ECIL Post, 500062, Hyderabad, India aut Raju V. National Centre for Compositional Characterization of Materials, Bhabha Atomic Research Centre, ECIL Post, 500062, Hyderabad, India aut Kutty T. 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 42/11(2007-06-01), 3977-3984 0022-2461 42:11<3977 2007 42 10853 https://doi.org/10.1007/s10853-006-1404-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1404-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kumar Sanjiv National Centre for Compositional Characterization of Materials, Bhabha Atomic Research Centre, ECIL Post, 500062, Hyderabad, India aut NATIONALLICENCE 700 1- Raju V. National Centre for Compositional Characterization of Materials, Bhabha Atomic Research Centre, ECIL Post, 500062, Hyderabad, India aut NATIONALLICENCE 700 1- Kutty T. 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 42/11(2007-06-01), 3977-3984 0022-2461 42:11<3977 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer