Abstract
In this study, the crystallization process of SrTiO3 thin films, prepared by a chemical method, was characterized by Fourier Transformed Infra Red (FT-IR), Grazing Incident X-ray Diffraction (GIXRD), Thermal Analysis (TG) and X-ray Absorption Near Edge Structure (XANES). The results showed that an amorphous inorganic phase is formed, consisting of clusters of oxygen five-coordinate titanium. The amorphous phase begins crystallizing at temperatures above 450 °C. No intermediate crystalline phase and no preferential orientation was observed for films deposited on MgO (100). FT-IR results suggest the presence of the carbonate group. However, the low thermal stability of this group and the low crystallization temperature of the observed SrTiO3 phase indicate that this carbonate is adsorbed.
Highlights
Ferroelectric thin films have been intensively studied due to the intense technological and scientific interest in their potential applications
During the crystallization process of thin films chemically prepared by the polymeric precursor method, an intermediate inorganic amorphous phase is observed after the pyrolysis step5-7
Gust et al.9 showed that BaTiO3 thin films prepared by sol-gel present an intermediate phase, presumably BaTiO2.CO3, that is subsequently transformed into BaTiO3
Summary
Ferroelectric thin films have been intensively studied due to the intense technological and scientific interest in their potential applications. Schwartz et al., using a standard glass nucleation approach, proposed a model in which the degree of orientation and microstructure of thin films prepared by MOD are correlated with the thermodynamic barrier to nucleation They showed that a change in the crystallization driving force results in a microstructural modification due to the variation that occurs in the barrier heights for interface (film/substrate) and surface nucleation. In another recent paper, Gust et al. showed that BaTiO3 thin films prepared by sol-gel present an intermediate phase, presumably BaTiO2.CO3, that is subsequently transformed into BaTiO3. Random nucleation in the film was observed for different substrates
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