Dielectric and grain-boundary characteristics of hot pressed CaCu 3Ti4O12

Byeong Kon Kim, Hyung Sub Lee, Jung Won Lee, Seung Eun Lee, Yong Soo Cho

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Abstract

Effects of hot pressing (HP) on the dielectric and grain-boundary characteristics of copper titanate (CaCu3Ti4O12 or CCTO) materials were studied with the comparison of conventionally prepared samples. HP at 1100°C in N2 atmosphere resulted in uniformly distributed smaller grain sizes and less Cu-rich grain boundaries, without the accompanying secondary CuO phase. The high effective permittivity of ∼3 × 104 at 1 kHz, obtained in the HP sample having a relatively smaller grain size of ∼2.4 μm, is assumed to be associated with a higher dielectric constant of thinner grain-boundary phases. The low grain-boundary resistivities of 199-319 kΩ·cm in the HP samples are likely induced by the N2 atmosphere and less Cu-rich grain-boundary phase.

Original languageEnglish
Pages (from-to)2419-2422
Number of pages4
JournalJournal of the American Ceramic Society
Volume93
Issue number9
DOIs
Publication statusPublished - 2010 Sep 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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