Giant Dielectric Constant and Good Temperature Stability in Y2/3Cu3Ti4O12 Ceramics
作者： Pengfei Liang , Zupei Yang , Xiaolian Chao , Zonghuai Liu
DOI: 10.1111/J.1551-2916.2012.05152.X
关键词:
摘要: Y2/3Cu3Ti4O12 ceramics were successfully prepared by the conventional solid-state reaction method. Effects of sintering conditions on microstructure, phase structure, and dielectric properties investigated in detail. sintered at 1010°C for 25 h exhibited a giant constant (1.10 × 104) relatively low loss (0.033) around room temperature. The samples showed good temperature stability (ΔCT/C25∘C=-6.7% – 9.5%) range from −60°C to 125°C 10 kHz. It was also found that new relaxation III appeared higher temperatures (>200°C). complex impedance spectroscopy analysis suggested electrically heterogeneous, they consisted semiconducting grains insulating grain boundaries, which could be modeled first approximation an equivalent circuit based two parallel RC elements connected series. Cu2+/Cu3+ Ti3+/Ti4+ aliovalences observed ceramics. permittivity phenomenon explained internal barrier layer capacitance (IBLC) effect.
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