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

被引：13

作者：

Tian Bao-Li ^{[1
,2
]}

Du Zu-Liang ^{[1
]}

Ma Yan-Mei ^{[2
]}

Li Xue-Fei ^{[2
]}

Cui Qi-Liang ^{[2
]}

Cui Tian ^{[2
]}

Liu Bing-Bing ^{[2
]}

Zou Guang-Tian ^{[2
]}

机构：

[1] Henan Univ, Key Lab Special Funct Mat, Minist Educ, Kaifeng 457004, Peoples R China

[2] Jilin Univ, State Key Lab Superhard Mat, Changchun 130012, Peoples R China

来源：

CHINESE PHYSICS LETTERS | 2010年 / 27卷 / 02期

基金：

中国国家自然科学基金;

关键词：

STRUCTURAL FEATURES; TIO2; ABSORPTION; STABILITY; FIELD; DOT;

D O I：

10.1088/0256-307X/27/2/026103

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 (H0.7Ti1.825V0.175O4 center dot 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.

引用

页数：4

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