Sintering behavior and dielectric properties of KCa2Nb3O10 ceramics

Sang Hyo Kweon, Mir Im, Guifang Han, Jin Seong Kim, Sahn Nahm, Ji Won Choi, Seong Ju Hwang

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Abstract

Dense KCa2Nb3O10 (KCN) oxides were synthesized and their dielectric properties were investigated. A homogeneous KCN phase was formed in the specimen sintered above 1300°C, but a CaNb2O6 secondary phase was developed in the specimen sintered at 1400°C, as result of the evaporation of K2O. The KCN oxides sintered at 1375°C showed a high relative density that was 97.1% of the theoretical density. Furthermore, liquid-phase-assisted abnormal grain growth occurred during sintering. The dielectric constant of this KCN oxide was 46, with a low dielectric loss of 0.9% at 100kHz; these values are smaller than those that were previously reported. Complex impedance analysis indicated that the resistivity of the KCN oxide was very low, probably as a result of the presence of K+ ions between the layers, and this could be the origin of the low-frequency dispersion of the KCN oxides.

Original languageEnglish
Pages (from-to)907-911
Number of pages5
JournalJournal of the European Ceramic Society
Volume33
Issue number5
DOIs
Publication statusPublished - 2013 May 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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