Microscopic origin of polarity in quasiamorphous BaTiO 3

A. I. Frenkel, Y. Feldman, V. Lyahovitskaya, E. Wachtel, Igor Lubomirsky

Research output: Contribution to journalArticle

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Abstract

The recent observation of pyroelectricity in quasiamorphous thin films of BaTiO 3 introduced a previously unreported type of polar ionic solid where the appearance of a macroscopic dipole moment is not accompanied by long-range crystal-like order. This poses a question regarding the mechanism of polarity in noncrystalline ionic systems and the nature of their local dipoles. By combining x-ray diffraction and x-ray-absorption fine-structure spectroscopy techniques we have identified the local dipoles as stable but distorted TiO 6 octahedra. The magnitude of the off-center displacement of the Ti ion and the concomitant dipole moment in both quasiamorphous (polar) and amorphous (nonpolar) BaTiO 3 were found to be nearly twice as large as those in bulk BaTiO 3. We propose that the mechanism of macroscopic polarity in quasiamorphous BaTiO 3 is in a weak orientational ordering of the TiO 6 bonding units. In this view, one may expect that other amorphous ionic oxides containing stable local bonding units, for example NbO 6, TiO 6, or VO 6, may also form noncrystalline polar phases.

Original languageEnglish
Article number024116
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume71
Issue number2
DOIs
Publication statusPublished - Jan 2005

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Dipole moment
polarity
dipole moments
Pyroelectricity
pyroelectricity
dipoles
X rays
x ray absorption
Oxides
x ray diffraction
Diffraction
fine structure
Spectroscopy
Ions
Thin films
Crystals
oxides
thin films
spectroscopy
crystals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Microscopic origin of polarity in quasiamorphous BaTiO 3 . / Frenkel, A. I.; Feldman, Y.; Lyahovitskaya, V.; Wachtel, E.; Lubomirsky, Igor.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 71, No. 2, 024116, 01.2005.

Research output: Contribution to journalArticle

Frenkel, A. I. ; Feldman, Y. ; Lyahovitskaya, V. ; Wachtel, E. ; Lubomirsky, Igor. / Microscopic origin of polarity in quasiamorphous BaTiO 3 . In: Physical Review B - Condensed Matter and Materials Physics. 2005 ; Vol. 71, No. 2.
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