Effect of copper-rich secondary phase at the grain boundaries on the varistor properties of CaCu3Ti4O12 ceramics

Li Then Mei, Hsing-I Hsiang, Tsang Tse Fang

研究成果: Article同行評審

51 引文 斯高帕斯(Scopus)

摘要

In this study, the relationship between the grain-boundary composition and varistor properties were investigated using scanning electron microscopy, transmission electron microscopy, energy dispersion spectroscopy, and X-ray photoelectric spectroscopy (XPS). It was found that the CaCu3Ti 4O12 (CCTO) sample did not exhibit varistor behavior when the compositions of grain boundary and grain were nearly the same before discontinuous grain growth. The CCTO sample exhibited varistor behavior after the occurrence of discontinuous grain growth. After discontinuous grain growth, copper (Cu)-rich secondary phase appeared at the grain boundaries. The XPS results reveal that Cu+ is the major content of the second phases. The formation of negatively charged species, or, existing at the grain boundaries due to the oxidation of the secondary phase during cooling after sintering can act as acceptors, forming double Schottky barriers with the n-type semiconductor grains.

原文English
頁(從 - 到)3735-3737
頁數3
期刊Journal of the American Ceramic Society
91
發行號11
DOIs
出版狀態Published - 2008 11月 1

All Science Journal Classification (ASJC) codes

  • 陶瓷和複合材料
  • 材料化學

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