Strongly intrinsic anharmonicity in the low-frequency Raman mode in nanocrystalline anatase TiO2

作者：Gao Kun^*

来源：Physica B: Condensed Matter , 2007, 398(1): 33-37.

DOI：10.1016/j.physb.2007.04.013

• titanium dioxide
• Raman spectroscopy
• nanocrystalline anatase
• anharmonicity

Temperature dependence of Raman spectra was obtained to study the unusual hardening behavior of lowest-frequency Raman mode of nanocrystalline anatase TiO2. A model was employed to analyze the frequency shifts of three Raman modes upon increasing temperature firstly. The pure-volume and pure-temperature contributions to the frequency shifts of three Raman modes have been calculated. The result indicated that the strongly intrinsic anharmonicity arising from optical-phonon couplings was the origin of hardening upon increasing temperature for the Raman mode frequencies.

• 出版日期2007-8-1
• 单位中国科学技术大学