Effect of MgO and Y2O3 doping on the formation of core-shell structure in BaTiO3 ceramics

Che Yuan Chang, Wan Ning Wang, Chi Yuen Huang

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21 Citations (Scopus)

Abstract

This study investigates the effects of doping BaTiO3 with MgO and Y2O3 on the formation of core-shell structure. The MgO and Y2O3 enhanced the shrinkage upon sintering and inhibited the grain growth, respectively. However, increasing the amount of Y2O3 to 3.0 mol% suppressed the shrinkage upon sintering. The results of the diffusion experiment revealed that Y3+ was dissolved in the BaTiO3 lattice to a depth of 5-10 nm inside the grains, whereas Mg2+ tended to remain close to the surfaces of the grains when sintered at 1150°C for 18 h, suggesting that Y3+ may have had a higher diffusion rate than Mg2+. The Mg2+ prevented the diffusion of Y3+ into the core during sintering. Therefore, Mg2+ plays an important role as a shell maker in the formation of the core-shell structure in the codoped system. The core-shell structure can be obtained in BaTiO3 ceramics that are codoped with MgO and Y2O3 upon sintering at 1150°C for 3 h.

Original languageEnglish
Pages (from-to)2570-2576
Number of pages7
JournalJournal of the American Ceramic Society
Volume96
Issue number8
DOIs
Publication statusPublished - 2013 Aug 1

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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