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Giant Dielectric Constant and Good Temperature Stability in Y2/3Cu3Ti4O12 Ceramics

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Y2/3Cu3Ti4O12 ceramics were successfully prepared by the conventional solid‐state reaction method. Effects of sintering conditions on microstructure, phase structure, and the dielectric properties of Y2/3Cu3Ti4O12 ceramics were investigated in detail. Y2/3Cu3Ti4O12 ceramics sintered at 1010°C for 25 h exhibited a giant dielectric constant (1.10 × 104) and a relatively low dielectric loss (0.033) around room temperature. The samples showed good temperature stability (ΔCT/C25C=6.7% – 9.5%) in the temperature range from −60°C to 125°C at 10 kHz. It was also found that a new dielectric relaxation III appeared at higher temperatures (>200°C). The complex impedance spectroscopy analysis suggested that Y2/3Cu3Ti4O12 ceramics were electrically heterogeneous, and they consisted of semiconducting grains and insulating grain boundaries, which could be modeled to a first approximation on an equivalent circuit based on two parallel RC elements connected in series. The Cu2+/Cu3+ and Ti3+/Ti4+ aliovalences were observed in Y2/3Cu3Ti4O12 ceramics. The giant permittivity phenomenon could be explained by internal barrier layer capacitance (IBLC) effect.
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Document Type: Research Article

Publication date: July 1, 2012

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