Substrate-suppressed phase transition in nano-crystalline BaTiO3 thin films

J. P. Nair, N. Stavitski, I. Zon, K. Gartsman, I. Lubomirsky, A. L. Roytburd

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Upon substrate removal nano-crystalline cubic BaTiO3 thin films transformed into the tetragonal phase. Randomly oriented nano-crystalline BaTiO3 films were prepared with moderate residual tensile stress by sol-gel processing or RF sputtering. The low dielectric constant (110 ± 20) and the X-ray diffraction spectra identified the films as being cubic at room temperature. Despite the tensile stress in the substrate-supported films, the free-standing films became corrugated, indicating 0.3-0.5% lateral expansion. The fact that the cubic-to-tetragonal phase transition was responsible for the lateral expansion has been confirmed by a fivefold increase of the dielectric constant (620 ± 10) and a detectable piezoelectric effect.

Original languageEnglish
Pages (from-to)782-787
Number of pages6
JournalEurophysics Letters
Volume60
Issue number5
DOIs
Publication statusPublished - Dec 1 2002

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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