caa a22 4500 463234219 CHVBK 20180405153251.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1101-9 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1101-9 Abnormal oxidation behavior of YBa2Cu3O7−δ ceramics [Elektronische Daten] [Evelyne Cazy, Ali Khalfi, David Smith, Marc Huger, Jean Bonnet] The influence of sample thickness and cooling rate on the oxidation kinetics of dense small grain YBa2Cu3O7−δ ceramics is presented. The oxidation behavior is strongly dependent on the phase type exhibited by the material. At high temperature, in the tetragonal phase, the oxygen stoichiometry of the ceramic core is dependent on the diffusion length and isothermal treatments improve the overall. Value increase in the sample thickness decreases the oxygen content. At low temperature, in the orthorhombic phase, the oxidation during cooling becomes very fast and the sample thickness is not observed to be a limiting parameter. An ultrasonic determination of Young's modulus as a function of temperature shows that this behavior cannot be related to the formation of microcracks. The improvement in oxidation observed in this temperature range is considered as characteristic of a very fast diffusion of oxygen along the grain boundaries, which is enhanced below the tetragonal to orthorhombic transition by the stresses resulting from anisotropic thermal contraction. Springer Science+Business Media, LLC, 2007 Cazy Evelyne Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut Khalfi Ali Laboratoire des Matériaux et Systèmes Réactifs, Faculté des Sciences de l'Ingérieur, University of Djillali LLABES, 22000, Sidi Bel Abbes, Algeria aut Smith David Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut Huger Marc Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut Bonnet Jean Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6310-6315 0022-2461 42:15<6310 2007 42 10853 https://doi.org/10.1007/s10853-006-1101-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1101-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Cazy Evelyne Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut NATIONALLICENCE 700 1- Khalfi Ali Laboratoire des Matériaux et Systèmes Réactifs, Faculté des Sciences de l'Ingérieur, University of Djillali LLABES, 22000, Sidi Bel Abbes, Algeria aut NATIONALLICENCE 700 1- Smith David Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut NATIONALLICENCE 700 1- Huger Marc Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut NATIONALLICENCE 700 1- Bonnet Jean Groupe d'Etude des Matériaux Héterogènes, Ecole Nationale Supérieure de Céramique Industrielle, 47, avenue Albert Thomas, 87065, Limoges-cedex, France aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6310-6315 0022-2461 42:15<6310 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer