Acta Optica Sinica, Volume. 36, Issue 2, 216002(2016)
Dielectric Modulation of Nd2O3 Doped CaCu3Ti4O12 Ceramics at Terahertz Region
The modulation of dielectric constant and loss at terahertz (THz) frequency of CaCu3Ti4O12 (CCTO) ceramics is achieved by doping Nd2O3. Nd2O3 doped CCTO samples are prepared by solid-state reaction method. Structure analysis shows that the Nd ions do not affect the basic crystalline structure of CCTO. With the help of morphologic characterization, one can find that grain size increases when increasing the concentration of Nd2O3 first. But it decreases when the concentration of Nd2O3 exceed 0.6 % (mass fraction). An evident refinement effect occurs when the concentrations of Nd2O3 increases monotonically. THz spectroscopic measurement shows that the variation of real part of dielectric constant is contrary to that of grain-size of CCTO, while the loss variation is in agreement with the trend of grain-size variation. The results indicate that the dielectric constant at THz frequency of CCTO ceramics can be modulated effectively by doping Nd2O3.
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Dai Xiusong, Zhao Zhenyu, Song Zhiqiang, He Xiaoyong, Shi Wangzhou. Dielectric Modulation of Nd2O3 Doped CaCu3Ti4O12 Ceramics at Terahertz Region[J]. Acta Optica Sinica, 2016, 36(2): 216002
Category: Materials
Received: Jul. 17, 2015
Accepted: --
Published Online: Jan. 25, 2016
The Author Email: Xiusong Dai (daixiusong@126.com)