Phase transition in ferroelectric SrBi2Ta2O9 thin films with change of heat-treatment temperature

Tetsuya Osaka, Akira Sakakibara, Tomonori Seki, Sachiko Ono, Ichiro Koiwa, Akira Hashimoto

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52 Citations (Scopus)

Abstract

Changes in the composition and the crystal structure of micro-grains have been studied using transmission electron microscopy (TEM) and energy dispersive X-ray microanalysis in order to clarify the phase formation of ferroelectric SrBi2Ta2O9 (SBT) with heat-treatment at 650-750°C. Micrograins crystallized at 650°C begin to change to bismuth-layer-structure-family (BLSF) grains at temperatures exceeding 700°C, and form pure-BLSF phase grains at 800°C. Hence, a micrograins phase exists in thin films at 650-750°C and we determined that the bismuth composition in these grains decreases. Using selected diffraction and high-resolution TEM, we found that a pyrochlore phase was formed in the bismuth-poor micrograins that were heat treated at 750°C. The formation of pyrochlore made pure-phase BLSF difficult to obtain.

Original languageEnglish
Pages (from-to)597-601
Number of pages5
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume37
Issue number2
Publication statusPublished - 1998 Feb 1

Keywords

  • All-alkoxide precursor solution
  • Bismuth-layer-structure
  • Chemical liquid deposition
  • Ferroelectric thin film
  • Heat-treatment temperature
  • Phase transition
  • Pyrochlore
  • Srbitao

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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