Journal of Materials Science

, Volume 27, Issue 21, pp 5713–5719 | Cite as

Dielectric properties and microstructural behaviour of B-site calcium-doped barium titanate ceramics

  • J. G. Park
  • T. S. Oh
  • Y. H. Kim
Papers

Abstract

Dielectric properties and microstructural behaviour of Ba1−xSrxTi1−yCayO3−y ceramics, where strontium and calcium were doped on the barium and titanium sites, respectively, within the range 0⩽x⩽0.24 and 0⩽y⩽0.05, were investigated. Calcium addition decreased the tetragonality,c/a, increased the unit cell volume, and lowered the Curie temperature, which were all attributed to the occupancy of Ca2+ ions on titanium sites. When sintered at a low oxygen partial pressure of 10−9 MPa, a resistivity higher than 1011 ω cm was maintained for the formulations containing B-site calcium substitution more than 0.5 mol %. With increasing the amount of calcium addition, the Curie peak was depressed and completely broadened for the compositions with calcium addition more than 3 mol %, where the average grain size was smaller than 1 μm. Co-firing with nickel electrodes in a reducing atmosphere also depressed the Curie peak and inhibited the grain growth due to the diffusion of nickel into the dielectrics.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • J. G. Park
    • 1
  • T. S. Oh
    • 1
  • Y. H. Kim
    • 1
  1. 1.Fine Ceramics LaboratoryKorea Institute of Science and TechnologyCheongryang, SeoulKorea

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