Microstructure effect on dielectric Properties of MgO-doped BaTiO3-BiYO3 ceramics

Xuechen Huang, Hanxing Liu, Hua Hao, Shujun Zhang, Yue Sun, Wenqin Zhang, Lin Zhang, Minghe Cao

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MgO-doped 0.97BaTiO3-0.03BiYO3 (0.97BT-0.03BY) polycrystalline ceramics were prepared by the solid-state sintering method. Then the structural, dielectric and resistant properties were investigated as functions of MgO addition. Microstructure was studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM) and energy dispersive spectrometry (EDS). The results show that Bi3+, Y3+ and Mg2+ ions exhibit nonuniform distribution behavior in BT-BY ceramics, demonstrating the existence of a core-shell structure, which plays important roles in the capacitance-temperature characteristics, where 0.97BT-0.03BY with the addition 2.2-2.8 at% MgO meets the Electronic Industries Association (EIA) X8R (-55 to 150 °C, ΔC/C25 °C=±15% or less) specification. Moreover, the fine-grained samples with core-shell structure show much higher bulk resistance than the coarse-grained samples over the studied temperature range, which is attributed to the higher proportion of grain boundaries and the lower concentration of the effective acceptor.

Original languageEnglish (US)
Pages (from-to)7489-7495
Number of pages7
JournalCeramics International
Issue number6
StatePublished - Jul 1 2015

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry


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