Chemical composition and phase identification of sodium titanate nanostructures grown from titania by hydrothermal processing |
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Authors: | R.A. Zá rate,S. Fuentes,V.M. Fuenzalida |
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Affiliation: | a Departamento de Física, Facultad de Ciencias, Universidad Católica del Norte, Casilla 1280, Antofagasta, Chile b Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Casilla 487-3, Santiago, Chile c Facultad de Física, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile |
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Abstract: | Fine titanium dioxide particles were hydrothermally treated in a sodium hydroxide aqueous solution. The treatment extended from 1 to 6 days leading to belt-like and wire-like structures of a metastable phase of sodium titanate, with typical widths and diameters between 8 and 40 nm, and lengths from 100 nm to several micrometers. These conclusions are supported by X-ray photoelectron spectroscopy, X-ray diffraction, Raman spectroscopy and high resolution transmission electron microscopy. The latter method revealed two set of space fringes with characteristic distances of 0.29 and 0.34 nm. These distances could correspond to the lattice spacing of and planes in Na2Ti6O13 compounds. The nanomaterial was found to be stable up to temperatures as high as 200 or depending on the reaction time and the concentration. |
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Keywords: | C. X-ray diffraction |
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