Novel SrTi1-xFexO3 nanocubes synthesized by microwave-assisted hydrothermal method
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Data
2012-01-01
Autores
da Silva, Luis F.
Avansi, Waldir [UNESP]
Moreira, Mario L. [UNESP]
Andres, Juan
Longo, Elson [UNESP]
Mastelaro, Valmor R.
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Royal Soc Chemistry
Resumo
We report herein for the first time a facile synthesis method to obtain SrTi1-xFexO3 nanocubes by means by a microwave-assisted hydrothermal (MAH) method at 140 degrees C. The effect of iron addition on the structural and morphological properties of SrTiO3 was investigated. X-ray diffraction measurements show that all STFO samples present a cubic perovskite structure. X-ray absorption spectroscopy at Fe absorption K-edge measurements revealed that iron ions are in a mixed Fe2+/Fe3+ oxidation state and preferentially occupy the Ti4+-site. UV-visible spectra reveal a reduction in the optical gap (E-gap) of STFO samples as the amount of iron is increased. An analysis of the data obtained by field emission scanning electron microscopy points out that the nanoparticles present a cubic morphology independently of iron content. According to high-resolution transmission electron microscopy results, these nanocubes are formed by a self-assembly process of small primary nanocrystals.
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Crystengcomm. Cambridge: Royal Soc Chemistry, v. 14, n. 11, p. 4068-4073, 2012.