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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Grain-boundary and subgrain-boundary effects on the dielectric properties of CaCu3Ti4O12 ceramics
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Grain-boundary and subgrain-boundary effects on the dielectric properties of CaCu3Ti4O12 ceramics

机译：晶界和亚晶界对CaCu3Ti4O12陶瓷介电性能的影响

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摘要

CaCu3Ti4O12 ceramic samples sintered at different temperatures were studied by measurements of microstructural and dielectric properties. Electron microscopy for thermally-etched samples confirmed a microstructure with subgrains (SG) buried in a crystalline grain. The detailed dielectric properties were shown to be conformable with the double-barrier-layer capacitance model. The complex electric modulus analysis revealed unambiguously each contribution of the SG interiors, SG boundaries and grain boundaries to the dielectric constant. Our result clarified how the dielectric properties change with increasing sintering temperature. It was concluded that grain boundaries rather than SG boundaries played the key role in the low-frequency giant dielectric constant in CCTO ceramics.
机译：通过测量微观结构和介电性能，研究了在不同温度下烧结的CaCu3Ti4O12陶瓷样品。对热蚀刻样品进行的电子显微镜检查证实了具有埋在晶粒中的亚晶粒（SG）的微观结构。详细的介电性能显示与双势垒层电容模型相符。复数模量分析清楚地表明了SG内部，SG边界和晶界对介电常数的每种贡献。我们的结果阐明了介电性能如何随烧结温度的升高而变化。结论是，晶界而不是SG边界在CCTO陶瓷的低频巨介电常数中起着关键作用。

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