期刊
JOURNAL OF ADVANCED DIELECTRICS
卷 6, 期 1, 页码 -出版社
WORLD SCIENTIFIC PUBL CO PTE LTD
DOI: 10.1142/S2010135X16500090
关键词
CaCu3Ti4O12; grain boundary; bulk conduction; electrochemical techniques; dispersion; dielectric properties
资金
- Natural Science Foundation of China [11564010, 11264010, 21061004, 50962004]
- Natural Science Foundation of Guangxi [GA139008]
CaCu3Ti4-xYxO12 (0 <= x <= 0.12) ceramics were fabricated with conventional solid-state reaction method. Phase structure and microstructure of prepared ceramics were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. The impedance and modulus tests both suggested the existence of two different relaxation behavior, which were attributed to bulk and grain boundary response. In addition, the conductivity and dielectric permittivity showed a step-like behavior under 405 K. Meanwhile, frequency independence of dc conduction became dominant when above 405 K. In CCTO ceramic, rare earth element Y3+ ions as an acceptor were used to substitute Ti sites, decreasing the concentration of oxygen vacancy around grain-electrode and grain boundary. The reason to the reduction of dielectric behavior in low frequencies range was associated with the Y doping in CCTO ceramic.
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