The microstructure characteristics and dielectric behaviors of the compositionally graded Ba(Ti,Sn)O3 thin films

Jiwei Zhai*, Sannian Song, Xi Yao, T. F. Hung, Zhengkui Xu, Haydn Chen

*Corresponding author for this work

Research output: Contribution to journalConference article

Abstract

The compositionally graded Ba(SnxTi1-x)O3 (BTS) films with a compositional gradient from BaTiO3 to BaSn 0.15Ti0.85O3 were fabricated on LNO-buffered Pt/Ti/SiO2/Si substrates by a sol-gel deposition method. The graded films crystallized into a pure perovskite structure after post-deposition annealing. The gradient of increasing Ti and decreasing Sn content from the surface of the film to the substrate was nicely demonstrated by the XPS data. Dielectric properties were investigated as a function of both temperature and frequency. It was observed that leakage currents increased asymmetrically for the negative and positive bias voltage with compositional gradient films. Dielectric constant peaks, common to a ferroelectric transition, were not observed in the temperature range from -25°C to 150°C. Generally, ferroelectric material is tunable in only a narrow temperature range near a phase transition. Ba(SnxTi1-x)O3 compositionally graded films with weak temperature dependence of tunability in the temperature range between -25°C and 30°C could make attractive materials for situations in which precise control of temperature would be either impossible or too expensive.

Original languageEnglish
Pages (from-to)137-145
Number of pages9
JournalIntegrated Ferroelectrics
Volume74
DOIs
StatePublished - 1 Dec 2005
EventSeventeenth International Symposium on Integrated Ferroelectrics, ISIF-17 - Shanghai, China
Duration: 17 Apr 200520 Apr 2005

Keywords

  • BTS thin films
  • Composition gradient
  • Sol-gel
  • Tunability

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