Structural and dielectric characteristics in a Ca(Mg1/3Nb 2/3)O3-CaZrO3 system

Chun Te Lee, Chi-Yuen Huang, Yi Chang Lin, Jacky Yang, Ying Chieh Lee

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16 Citations (Scopus)

Abstract

This study investigates the effect of CaZrO3 (CZ) substitution on the evolution of an ordered structure in a Ca(Mg1/3Nb 2/3)O3 (CMN) system using Raman spectroscopy, X-ray diffractometry, and transmission electron microscopy. It indicates that a (1-x) CMN-(x)CZ solid solution has the 1:2 and 1:1 ordered structure distorted by the antiphase, the inphase tilting of oxygen octahedra, and the antiparallel shift of A-site cation. A distinct correlation is noted between the transition of the ordered structure and microwave dielectric properties. The differences in εr and τf are attributed exclusively to the differences in the type of cation arrangement. The structure with the 1:2 ordering exhibits a lower relative permittivity and a more negative τf than the structure with the 1:1 ordering. The increased fraction of compressed Nb-O bond in the 1:2 ordered structure associated with a large NbO6 octahedral distortion is correlated with a decrease in relative permittivity and change of τf toward more negative values. Simultaneously, the substitution of the Zr4+ ion causes a linear increase in polarizability, and it also results in an increase in the relative permittivity.

Original languageEnglish
Pages (from-to)3148-3155
Number of pages8
JournalJournal of the American Ceramic Society
Volume90
Issue number10
DOIs
Publication statusPublished - 2007 Oct 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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