Finite size effects on the ferroelectric phase transition of Bi 3.5La0.5Ti3O12 nano-particles

M. S. Islam, J. Kano, S. Kojima

Research output: Contribution to journalConference article

1 Citation (Scopus)

Abstract

The size effects on the successive phase transition of lanthanum doped ferroelectric bismuth titanate Bi3.5La0.5Ti 3O12 (BLT) nano-particles have been investigated. A dielectric anomaly appears around 520°C for all the size of nano-particles, corresponds to the low temperature monoclinic to orthorhombic phase transition that remains unaffected by the decrease of particle size. The optical soft phonons show a considerable broadening due to the reduction of particle size and completely overdamped below 34 nm. These results demonstrate a size induced ferroelectric orthorhombic to paraelectric tetragonal phase transition. It is confirmed by the temperature-dependence of the soft optical phonon that the first order displacive nature of the orthorhombic to tetragonal phase transition is hold even in nano-system.

Original languageEnglish
Pages (from-to)16-22
Number of pages7
JournalFerroelectrics
Volume402
Issue number1
DOIs
Publication statusPublished - Dec 1 2010
Externally publishedYes
Event12th International Meeting on Ferroelectricity, IMF-12 and the 18th IEEE International Symposium on Applications of Ferroelectrics, ISAF-18 - Xi'an, China
Duration: Aug 23 2009Aug 27 2009

Keywords

  • Layered-ferroelectrics
  • Nano-particles
  • Size effects
  • Soft mode
  • Successive phase transition

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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