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Title
Conducting grain boundaries in the high-dielectric-constant ceramic CaCu3Ti4O12
Article in journal
Authors
K. Chen, G. L. Li, Feng Gao, J. Liu, J. M. Liu, J. S. Zhu
Publication Year
2007
Source
Journal of Applied Physics, 2007, (101)7, 074101
Link to Source (DOI)
10.1063/1.2713943
Abstract
<p>To clarify the electrical property of grain boundaries, the fine-grained ceramics CaCu3Ti4O12 have been treated with the hydrofluoric acid to remove the parts of grain boundaries. The dielectric response difference between the etched samples and the pristine ones indicates that the ceramic CaCu3Ti4O12 consists of insulating or semiconducting grains with conducting grain boundaries. Therefore, the giant dielectric phenomenon is supposed not to derive from the grain boundary barrier layer capacitance effect. The possible mechanism is discussed. (c) 2007 American Institute of Physics.</p>