Wide band dielectric spectroscopy at ferroelectric phase transition of BaTiO3ceramics

Takashi Teranishi, Takuya Hoshina, Hiroaki Takeda, Takaaki Tsurumi

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ultrawide band dielectric spectra from kHz to THz were measured to investigate quantitatively the contributions of ionic and dipole polarizations to the ferroelectric phase transition in BaTiO3(BT) ceramics. Permittivity derived from ionic polarization (σionic) exhibited its maximum at the Curie temperature (Tc), attributing to the softening of the soft phonon mode. Permittivity derived from dipole polarization (σdipole) was nearly constant below the Tc, while σdipole remained above the Tcand σdipole increased on cooling, exhibiting its maximum near the Tc. The behavior in σdipole above the T ccould be interpreted as precursor phenomenon of ferroelectric phase transition and theσdipole above the Tcwas due to the local tetragonal type distortion in paraelectric phase.

Original languageEnglish
Pages (from-to)415061-415064
Number of pages4
JournalJapanese journal of applied physics
Volume49
Issue number4 PART 1
DOIs
Publication statusPublished - Apr 1 2010
Externally publishedYes

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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