caa a22 4500 463234685 CHVBK 20180405153253.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1252-8 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1252-8 Grain boundary analysis and secondary phases in LaCoO3-based perovskites [Elektronische Daten] [Per Vullum, Antonius van Helvoort, Randi Holmestad, Johann Mastin, Øystein Andersen, Mari-Ann Einarsrud, Tor Grande] Secondary phases and grain boundaries in LaCoO3 and La0.7Sr0.3CoO3−δ ceramics have been studied by transmission electron microscopy. Both materials contained small amounts of grains of a secondary phase; the face centered cubic spinel structure Co3O4, located at triple junctions. These grains were agglomerates of several smaller grains. High resolution electron microscopy combined with annular dark field scanning transmission electron microscopy and electron energy loss spectroscopy were used to analyze the grain boundaries. In LaCoO3, the grain boundaries were sharp with stable compositions of La, Co and O across the boundaries. In La0.7Sr0.3CoO3−δ, a 1-2nm thick intergranular layer between the grains was observed. This layer was rich in O and Co and deficient in Sr and La, compared to the nominal composition of the material. Springer Science+Business Media, LLC, 2007 Vullum Per Department of Physics, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut van Helvoort Antonius Department of Physics, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut Holmestad Randi Department of Physics, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut Mastin Johann Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut Andersen Øystein Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut Einarsrud Mari-Ann Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut Grande Tor Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6267-6273 0022-2461 42:15<6267 2007 42 10853 https://doi.org/10.1007/s10853-006-1252-8 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1252-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Vullum Per Department of Physics, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 700 1- van Helvoort Antonius Department of Physics, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Holmestad Randi Department of Physics, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Mastin Johann Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Andersen Øystein Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Einarsrud Mari-Ann Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 700 1- Grande Tor Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491, Trondheim, Norway aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6267-6273 0022-2461 42:15<6267 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer