Synthesis and structure of preferred-oriented Li2O-Nb2O5-TiO2 thin film with superstructure

Yo Yamamoto, Tohru Sekino, Hiroyuki Hayashi, Tadachika Nakayama, Takafumi Kusunose, Koichi Niihara

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Li1.18Nb0.82Ti0.18O3 thin film, which has LiNbO3-based subcell and resultant superstructure along its c-axis, was prepared on Al2O3 (0001) single-crystal substrate from alkoxide solutions by a sol-gel and a spin-coating process. The high-temperature X-ray diffraction measurement indicated that the coated gel film was crystallized at 500 °C, and the superstructure was formed at 800 °C. Thickness of the prepared film was typically 100 nm, and was synthesized by a one-step coating process. In order to achieve coexistence of preferred orientation with superstructure in a thin film, a two-step heat treatment was found to be an appropriate method. The layer of the superstructure was parallel to Al2O3 (0001) substrate. Some distribution of layer distance was observed by XRD and TEM. However, the degree of preferred orientation for two-step heat-treated film was estimated to be 1.0 by XRD, showing the advantage of the present processing to fabricate preferred-oriented superstructure thin film.

Original languageEnglish
Pages (from-to)2702-2706
Number of pages5
JournalMaterials Letters
Volume57
Issue number18
DOIs
Publication statusPublished - 2003 May 1

Keywords

  • Lithium niobate
  • Sol-gel preparation
  • Superstructure
  • TEM
  • Thin films
  • Titanium oxide

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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