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(0 0 l)-oriented Bi2Sr2Co2Oy and Ca3Co4O9 films / Xuebin Zhu in Acta materialia, Vol. 58 N° 12 (Juillet 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4281–4291 Titre : (0 0 l)-oriented Bi2Sr2Co2Oy and Ca3Co4O9 films : Self-assembly orientation and growth mechanism by chemical solution deposition Type de document : texte imprimé Auteurs : Xuebin Zhu, Auteur ; Dongqi Shi, Auteur ; Shixue Dou, Auteur Année de publication : 2011 Article en page(s) : pp. 4281–4291 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Self-assembly  Thermoelectric  Film  Chemical  solution  deposition Résumé : In this study, two typical cobaltate-based thermoelectric films, Bi2Sr2Co2Oy (BSC) and Ca3Co4O9 (CCO), with structures of [Bi2Sr2O4][CoO2]2 and [Ca2CoO3]RS[CoO2], respectively, are prepared by a simple chemical solution deposition on SrTiO3 (1 0 0), (1 1 0), and (1 1 1) single crystal substrates. X-ray results reveal that all films are c-axis oriented regardless of the orientation of the substrate, suggesting self-assembly orientation. Transmission electron microscopy reveals amorphous/delamination regions for BSC film on SrTiO3 (1 1 0), and the c-axis stripes of CCO on SrTiO3 (1 1 1) are inclined at 30° to the interface, whereas the c-axis stripes are parallel to the interfaces for other films. The growth mechanism is established, and the driving force for self-assembly c-axis orientation is attributed to the syneresis stress due to solvent evaporation. The microstructures and properties are also studied and discussed, with the conclusion that self-assembly c-axis oriented layered cobaltates films are good candidates for thermoelectric applications. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002375 [article] (0 0 l)-oriented Bi2Sr2Co2Oy and Ca3Co4O9 films : Self-assembly orientation and growth mechanism by chemical solution deposition [texte imprimé] / Xuebin Zhu, Auteur ; Dongqi Shi, Auteur ; Shixue Dou, Auteur . - 2011 . - pp. 4281–4291. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 12 (Juillet 2010) . - pp. 4281–4291 Mots-clés : Self-assembly  Thermoelectric  Film  Chemical  solution  deposition Résumé : In this study, two typical cobaltate-based thermoelectric films, Bi2Sr2Co2Oy (BSC) and Ca3Co4O9 (CCO), with structures of [Bi2Sr2O4][CoO2]2 and [Ca2CoO3]RS[CoO2], respectively, are prepared by a simple chemical solution deposition on SrTiO3 (1 0 0), (1 1 0), and (1 1 1) single crystal substrates. X-ray results reveal that all films are c-axis oriented regardless of the orientation of the substrate, suggesting self-assembly orientation. Transmission electron microscopy reveals amorphous/delamination regions for BSC film on SrTiO3 (1 1 0), and the c-axis stripes of CCO on SrTiO3 (1 1 1) are inclined at 30° to the interface, whereas the c-axis stripes are parallel to the interfaces for other films. The growth mechanism is established, and the driving force for self-assembly c-axis orientation is attributed to the syneresis stress due to solvent evaporation. The microstructures and properties are also studied and discussed, with the conclusion that self-assembly c-axis oriented layered cobaltates films are good candidates for thermoelectric applications. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410002375