Raman Investigation of Sodium Titanate Nanotubes under Hydrostatic Pressures up to 26.9GPa
Raman Investigation of Sodium Titanate Nanotubes under Hydrostatic Pressures up to 26.9GPa作者机构：State Key Laboratory of Superhard Materials Jilin University Changchun 130012 Key Laboratory for Special Functional Materials of Ministry of Education Henan University Kaifeng 457004
出 版 物：《Chinese Physics Letters》 (中国物理快报（英文版）)
年 卷 期：2010年第27卷第2期
页 面：199-202页
核心收录：
学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 080104[工学-工程力学] 0815[工学-水利工程] 0703[理学-化学] 070301[理学-无机化学] 0801[工学-力学（可授工学、理学学位）]
基 金：Supported by the National Natural Science Foundation of China under Grant Nos 50334030 and 100874040 the National Basic Research Program of China under Grant Nos 2005CB724400 and 2007CB616911 the International Science and Technology Cooperation Project of China under Grant No 2001CB711201 and the Cultivation Fund of the Key Scientific and Technical Innovation Project Ministry of Education of China (No 708062)
主 题：Condensed matter: electrical magnetic and optical Condensed matter: structural mechanical & thermal Nanoscale science and low-D systems
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＆#12539;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.
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