Jpn. J. Appl. Phys. 47 (2008) pp. 7725-7728  |Previous Article| |Next Article|  |Table of Contents|
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Analysis of Dielectric Response of TiO₂ in Terahertz Frequency Region by General Harmonic Oscillator Model

Naoki Matsumoto^1,2, Tadasu Hosokura¹, Keisuke Kageyama¹, Hiroshi Takagi¹, Yukio Sakabe¹, and Masanori Hangyo²

(Received May 28, 2008; accepted July 11, 2008; published online September 19, 2008)

The terahertz range dielectric response of polycrystalline TiO₂ (rutile) ceramics and rutile single crystals were investigated by analyzing infrared-active phonons by both Fourier-transform far-infrared (FT-FIR) reflectivity measurement and terahertz time-domain spectroscopy (THz-TDS). The dielectric functions at room temperature measured by THz-TDS are well expressed using the general harmonic oscillator model. We found that the imaginary part of the dielectric permittivity of the TiO₂ ceramic is threefold higher than that of the rutile single crystal at 300 K. The large dielectric loss is attributed to the additional damping of the A_2u mode or/and an increase in the phonon damping. The low-temperature dielectric loss of the rutile single crystals is exceedingly low. However, TiO₂ ceramics shows little temperature dependence. These results indicate that extrinsic scattering significantly affects the dielectric loss of the TiO₂ ceramics in the THz region.

URL: http://jjap.jsap.jp/link?JJAP/47/7725/
DOI: 10.1143/JJAP.47.7725

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