Terahertz dielectric properties of CaCu3Ti4O12 ceramics

被引：0

作者：

Dai, Xiusong ^{[1
]}

Zhao, Zhenyu ^{[1
]}

He, Xiaoyong ^{[1
]}

Shi, Wangzhou ^{[1
]}

机构：

[1] Department of Physics, Shanghai Normal University, Shanghai

来源：

Guangxue Xuebao/Acta Optica Sinica | 2015年 / 35卷 / 05期

关键词：

Materials; Scattering; Spectral properties; THz spectroscopy;

D O I：

10.3788/AOS201535.0516005

中图分类号：

学科分类号：

摘要：

Owing to the rapid development of capacitor for terahertz (1 THz=1012 Hz) electronics, the THz dielectric properties of different granular CaCu3Ti4O12 (CCTO) ceramics are investigated experimentally. It is found that the dielectric constant ε r of CCTO of small particles (Φ<2 μm) is below 700, while exceeds 2000 for larger granular (Φ >10 μm) CCTO in the frequency range below 1 MHz. Correspondingly, the dielectric loss of CCTO is from 0.1 to 0.6. In THz frequency range, however, different granular CCTO ceramics exhibts the same value of εr (εr =72±3). The ionic polarizability dominates εr, so that it is insensitive to the grain-size of CCTO. However, the larger grain-size increases the scattering cross-section, which enlargers the total extinction ratio of transmission so as to increase the dielectric loss in THz frequency range. It is found that the small granular CCTO is a potential dielectric materials for the application of THz capacitors. ©, 2015, Chinese Optical Society. All right reserved.

引用

页数：6

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