Preparation and Properties of CCTO-BCTO Ceramics with Ultrahigh Dielectric Constant

Abstract:

Ceramics of (1-x)CaCu₃Ti₄O₁₂-xBi_2/3Cu₃Ti₄O₁₂, i.e., CCTO-BCTO, with x=0, 0.01, 0.1 and 0.25, respectively, were prepared via the conventional solid-state reaction. The phase structure of the ceramics was identified by X-ray diffraction. The microstructure of the sample was observed with scanning electron microscopy. Dielectric properties and impedance spectroscopy were measured using a LCR Meter, in which 0.9CCTO-0.1BCTO displayed highest dielectric constant (584108) and lowest dielectric loss (0.42) at 1kHz among the four kinds of specimens. Based on series of experimental results, an optimum amount of x was able to improve the dielectric properties of CCTO-BCTO, through adjusting the impedance characteristics of the grain and grain boundary.

• Periodical: Advanced Materials Research (Volumes 760-762)
• Pages: 705-708
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.760-762.705
• Online since: September 2013
• Authors: La Chen, Wei Li, Zhao Xian Xiong, Chun Xiao Song, Hong Qiu
• Keywords: Ceramic, Dielectric Property, Impedance Spectroscopy

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