Journal ArticleDOI
Raman spectroscopy of nanophase TiO2
TLDR
In this paper, the Raman spectra for consolidated nanophase TiO2 particles in their as-compacted state and after annealing at a variety of temperatures up to 1273 K were reported.Abstract:
Raman spectra are reported for consolidated nanophase TiO2 particles in their as-compacted state and after annealing at a variety of temperatures up to 1273 K. The Raman-active bands normally observed for the rutile form of TiO2 were present in as-compacted samples having average grain sizes in the range from about 10 to 100 nm. However, significant broadening of these bands was found, which was uncorrelated with initial grain size, but not necessarily with other synthesis-related factors. This broadening decreased upon isochronal annealing at elevated temperatures in air. Based upon these observations, it is concluded that nanophase TiO2 in the as-consolidated state contains significant defect concentrations within the rutile grains and that these intragrain defects and the grain-boundary regions as well have local atomic structures with the rutile symmetry, albeit with some short-range displacements. Some sporadic sample regions containing small amounts (<5%) of the anatase form of TiO2 were also found; these traces of anatase transformed to rutile upon annealing in air at temperatures above 883 K.read more
Citations
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Journal ArticleDOI
Raman scattering study on anatase TiO2 nanocrystals
TL;DR: In this article, the evolution of the anatase phase in TiO2 nanocrystals during annealing was investigated using x-ray diffraction and the influence of interfacial vibrations on the Raman linewidth was also discussed.
Journal ArticleDOI
Sol−Gel Synthesis and Hydrothermal Processing of Anatase and Rutile Titania Nanocrystals
Chen-Chi Wang,Jackie Y. Ying +1 more
TL;DR: In this article, the synthesis of nanostructured TiO2 has been studied systematically to examine the processing parameters that control crystallite size and phase, and the results showed that nonagglomerated, ultrafine anatas...
Journal ArticleDOI
Calibration of the Raman spectrum to the oxygen stoichiometry of nanophase TiO2
J. C. Parker,R. W. Siegel +1 more
TL;DR: In this paper, the Raman spectrum of nanophase TiO2 was used to determine the oxygen-titanium ratio, and the thermogravimetric analysis studies used to calculate the ratio were discussed.
Journal ArticleDOI
Titanium oxide nanotubes, nanofibers and nanowires
Zhong-Yong Yuan,Bao-Lian Su +1 more
TL;DR: A simple one-step hydrothermal reaction among TiO2 powders and alkaline solution has been developed to synthesize low-dimensional titanate nanostructures.
Journal ArticleDOI
Mechanical behavior of nanocrystalline Cu and Pd
TL;DR: In this article, the bulk mechanical properties of samples of nanocrystalline Cu and Pd consolidated from powders prepared by inert gas condensation were studied. But the results of the study were limited.
References
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Journal ArticleDOI
Raman spectra of titanium dioxide
U. Balachandran,N.G. Eror +1 more
TL;DR: In this paper, the anatase and rutile phases of polycrystalline titanium dioxide using an argon ion laser as exciter were recorded at room temperature for the first-order Raman spectra.
Journal ArticleDOI
Raman Spectra of Ti O 2 , Mg F 2 , Zn F 2 , Fe F 2 , and Mn F 2
TL;DR: In this paper, the first-order Raman spectra have been measured at room temperature in five materials of the point group: Ti${\mathrm{O}}_{2}$, Mg${1g}$, Zn${2g}, Fe${3g} and Mn${4g}.
Journal ArticleDOI
X-ray diffraction studies of the structure of nanometer-sized crystalline materials
TL;DR: In this paper, the interference function of nanometer-sized crystalline iron (6-nm crystal size) was measured by x-ray diffraction and the measured interference function can only be matched by the computed one if the interfacial component is assumed to have no short- or long-range order.
Journal ArticleDOI
Diffusion in nanocrystalline material
TL;DR: In this paper, the self-diffusion of the radioisotope 67Cu in nanocrystalline copper has been measured by serial sectioning with the aid of ion-beam sputtering.
Journal ArticleDOI
Investigation of nanocrystalline iron materials by Mössbauer spectroscopy
TL;DR: In this paper, a two-component Mossbauer spectrum of a nanocrystalline material is investigated, consisting of a crystalline component and an interfacial component, formed by the atoms located either in the crystals or in the interfacial regions between them.
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