Raman Investigation of Sodium Titanate Nanotubes under Hydrostatic Pressures up to 26.9 GPa

High pressure behavior of sodium titanate nanotubes (Na2Ti2O5) is investigated by Raman spectroscopy in a diamond anvil cell (DAC) at room temperature. The two pressure-induced irreversible phase transitions are observed under the given pressure. One occurs at about 4.2 GPa accompanied with a new Ra...

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Bibliographic Details
Published in:Chinese physics letters 2010-02, Vol.27 (2), p.026103-026103
Main Authors: Bao-Li, Tian, Zu-Liang, Du, Yan-Mei, Ma, Xue-Fei, Li, Qi-Liang, Cui, Tian, Cui, Bing-Bing, Liu, Guang-Tian, Zou
Format: Article
Language:English
Subjects:
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Hydrostatic pressure
Nanotubes
Phase shift
Phase transformations
Sodium
Titanates
Titanium
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Summary:High pressure behavior of sodium titanate nanotubes (Na2Ti2O5) is investigated by Raman spectroscopy in a diamond anvil cell (DAC) at room temperature. The two pressure-induced irreversible phase transitions are observed under the given pressure. One occurs at about 4.2 GPa accompanied with a new Raman peak emerging at 834 cm-1 which results from the lattice distortion of the Ti-O network in titanate nanotubes. It can be can be assigned to Ti-O lattice vibrations within lepidocrocite-type (H0.7Ti1.825V0.175O 4.H2O)TiO6 octahedral host layers with V being vacancy. The structure of the nanotubes transforms to orthorhombic lepidocrocite structure. Another amorphous phase transition occurs at 16.7 GPa. This phase transition is induced by the collapse of titanate nanotubes. All the Raman bands shift toward higher wavenumbers with a pressure dependence ranging from 1.58--5.6 cm-1/GPa.
ISSN:0256-307X
1741-3540
DOI:10.1088/0256-307X/27/2/026103