Core/shell structure of ferroelectric (Ba0.94Ca 0.06)TiO3 grains

Yoshihiro Iwahori, Hiroshi Tanaka, Masaki Takata, Yoshihiro Terado, Chikako Moriyoshi, Yoshihiro Kuroiwa

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3 Citations (Scopus)


The crystal structure of ferroelectric (Ba0.94Ca 0.06)TiO3 (BCT) with small grains on an average of 1-μm in size has been investigated by using high-energy synchrotron-radiation powder-diffraction. A core/shell structure model, in which the grain consists of a core with tetragonal symmetry covered all over with a thin tetragonal shell with low tetragonality, is proposed and provides a markedly contrast with the core/shell structure of pure BaTiO3, which is generally known to have a shell with cubic symmetry. The higher permittivity of BCT is attributed to the characteristic shell structure with tetragonal symmetry. A change in the chemical bonding nature of BCT on the ferroelectric phase transition is clearly demonstrated in the electron charge density map.

Original languageEnglish
Pages (from-to)830-834
Number of pages5
JournalJournal of the Korean Physical Society
Issue number2 PART 1
Publication statusPublished - 2009 Aug
Externally publishedYes


  • Barium calcium titanate
  • Electron charge density
  • Maximum entropy method
  • Multi-layered ceramic capacitor
  • Powder diffraction
  • Synchrotron radiation

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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