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Segregation-induced grain boundary electrical potential in ionic oxide materials / D. Gómez-García in Acta materialia, Vol. 58 N° 19 (Novembre 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6404–6410 Titre : Segregation-induced grain boundary electrical potential in ionic oxide materials : A first principles model Type de document : texte imprimé Auteurs : D. Gómez-García, Auteur ; Juan J. Meléndez, Auteur ; Robert L. González-Romero, Auteur Année de publication : 2011 Article en page(s) : pp. 6404–6410 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Ceramics  Grain  boundary  defects  Segregation  Analytical  methods Résumé : A first principles continuum analytical model for cationic segregation to the grain boundaries in complex ceramic oxides is presented. The model permits one to determine the electric charge density and the segregation-induced electric potential profiles through the grain and can be extrapolated to the range of nanostructured grain sizes. The theoretical predictions are compared with existing data for yttria-stabilized tetragonal zirconia polycrystals. The implications for physical properties (mainly high temperature plasticity and hardening behaviour) are then discussed. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005069 [article] Segregation-induced grain boundary electrical potential in ionic oxide materials : A first principles model [texte imprimé] / D. Gómez-García, Auteur ; Juan J. Meléndez, Auteur ; Robert L. González-Romero, Auteur . - 2011 . - pp. 6404–6410. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 19 (Novembre 2010) . - pp. 6404–6410 Mots-clés : Ceramics  Grain  boundary  defects  Segregation  Analytical  methods Résumé : A first principles continuum analytical model for cationic segregation to the grain boundaries in complex ceramic oxides is presented. The model permits one to determine the electric charge density and the segregation-induced electric potential profiles through the grain and can be extrapolated to the range of nanostructured grain sizes. The theoretical predictions are compared with existing data for yttria-stabilized tetragonal zirconia polycrystals. The implications for physical properties (mainly high temperature plasticity and hardening behaviour) are then discussed. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410005069