Doping effects on dynamical physical properties of Ca 0.6Sr 0.4Bi 4Ti 4O 15 ferroelectric ceramics with layered-perovskite structure

M. S. Islam, J. Kano, Q. R. Yin, S. Kojima

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The change of electrical and lattice dynamical properties of ferroelectric Ca 0.6Sr 0.4Bi 4Ti 4O 15 (CSBT) ceramics were studied by doping with 0.1 wt.% of CeO 2 and MnO 2. The loss tangent and the AC conductivity decreased markedly due to the reduction of charge carrier. The activation energy of doped-CSBT increased owing to the reduction of intrinsic defects in the crystal lattice. For doped and pure CSBT, the appearance of thermal hysteresis and the satisfaction of the Cure-Weiss law by the dielectric susceptibility data assigned the first order nature of a ferroelectric phase transition. Especially in ferroelectric phases, the soft optic phonon mode showed the significant softening towards T 1 (at T 1, the square of soft mode frequency w 2 s →0) and w 2 s was approximately proportional to T 1-T, where T 1 is ∼70°C above T C0672°C, demonstrated a first order displacive nature of a ferroelectric phase transition. The invariance of lattice dynamical feature indicated that the crystal lattice did not influence markedly by the doping ions.

Original languageEnglish
Pages (from-to)89-94
Number of pages6
JournalJournal of Electroceramics
Volume28
Issue number2-3
DOIs
Publication statusPublished - May 1 2012
Externally publishedYes

Keywords

  • AC in conductivity-Phase transition
  • Layered-ferroelectrics
  • Soft mode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Mechanics of Materials
  • Electrical and Electronic Engineering
  • Materials Chemistry

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