Abnormal grain growth in undoped strontium and barium titanate / M. Bäurer in Acta materialia, Vol. 58 N° 1 (Janvier 2010)  

Public ISBD [article]  inActa materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 290–300 Titre : Abnormal grain growth in undoped strontium and barium titanate Type de document : texte imprimé Auteurs : M. Bäurer, Auteur ; S.-J. Shih, Auteur ; C. Bishop, Auteur Année de publication : 2010 Article en page(s) : pp. 290–300 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Abnormal grain growth Grain boundaries boundary migration Perovskites Analytical electron microscopy Résumé : Abnormal grain growth is a commonly observed phenomenon in perovskite materials. In order to study this phenomenon, grain growth experiments were conducted over a temperature range from 1425 to 1600 °C for the model system SrTiO3 to analyse the nucleation of abnormal grains and to identify the growth mechanism involved for normal and abnormal grains. Grain boundaries of normal and abnormal grains were investigated in quenched samples by high-resolution transmission electron microscopy and by energy-dispersive spectroscopy in a scanning transmission electron microscope. No amorphous film was observed at the grain boundaries for either normal or abnormal grains. Non-stoichiometry at the grain boundaries was identified as a possible reason for the differences in growth speed. The results are compared to the nucleation and growth of abnormal grains in BaTiO3. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006028 [article] Abnormal grain growth in undoped strontium and barium titanate [texte imprimé] / M. Bäurer, Auteur ; S.-J. Shih, Auteur ; C. Bishop, Auteur . - 2010 . - pp. 290–300. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 1 (Janvier 2010) . - pp. 290–300 Mots-clés : Abnormal grain growth Grain boundaries boundary migration Perovskites Analytical electron microscopy Résumé : Abnormal grain growth is a commonly observed phenomenon in perovskite materials. In order to study this phenomenon, grain growth experiments were conducted over a temperature range from 1425 to 1600 °C for the model system SrTiO3 to analyse the nucleation of abnormal grains and to identify the growth mechanism involved for normal and abnormal grains. Grain boundaries of normal and abnormal grains were investigated in quenched samples by high-resolution transmission electron microscopy and by energy-dispersive spectroscopy in a scanning transmission electron microscope. No amorphous film was observed at the grain boundaries for either normal or abnormal grains. Non-stoichiometry at the grain boundaries was identified as a possible reason for the differences in growth speed. The results are compared to the nucleation and growth of abnormal grains in BaTiO3. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409006028

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