Influence of the network modifier on the characteristics of MSnO3 (M=Sr and,Ca) thin films synthesized by chemical solution deposition
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Data
2013-03-01
Autores
Alves, M. C. F.
Marinho, R. M. M.
Casali, G. P.
Siu-Li, M.
Deputier, S.
Guilloux-Viry, M.
Souza, A. G.
Longo, E. [UNESP]
Weber, I. T.
Santos, I. M. G.
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Editor
Elsevier B.V.
Resumo
CaSnO3 and SrSnO3 alkaline earth stannate thin films were prepared by chemical solution deposition using the polymeric precursor method on various single crystal substrates (R- and C-sapphire and 100-SrTiO3) at different temperatures. The films were characterized by X-ray diffraction (theta-2 theta, omega- and (phi-scans), field emission scanning electron microscopy, atomic force microscopy, micro-Raman spectroscopy and photoluminescence. Epitaxial SrSnO3 and CaSnO3 thin films were obtained on SrTiO3 with a high crystalline quality. The long-range symmetry promoted a short-range disorder which led to photoluminescence in the epitaxial films. In contrast, the films deposited on sapphire exhibited a random polycrystalline growth with no meaningful emission regardless of the substrate orientation. The network modifier (Ca or Sr) and the substrate (sapphire or SrTiO3) influenced the crystallization process and/or the microstructure. Higher is the tilts of the SnO6 octahedra, as in CaSnO3, higher is the crystallization temperature, which changed also the nucleation/grain growth process. (C) 2012 Elsevier Inc. All rights reserved.
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Palavras-chave
Perovskite, Stannates, Chemical solution deposition, Polymeric precursor method, Epitaxial growth, Photoluminescence
Como citar
Journal Of Solid State Chemistry. San Diego: Academic Press Inc Elsevier Science, v. 199, p. 34-41, 2013.