High energy-resolution electron energy-loss spectroscopy study of electronic structures of barium titanate nanocrystals

Keigo Suzuki, Masami Terauchi, Yusuke Uemichi, Kazunori Kijima

研究成果: Article査読

8 被引用数 (Scopus)

抄録

High energy-resolution electron energy-loss spectra were obtained from barium titanate (BaTiO3) nanocrystals (BTNCs), which were synthesized by chemical vapor deposition using inductively coupled plasma. Onset energies of spectral intensities were 3.2 eV for 34 nm BTNCs and 3.5 eV for 6 nm BTNCs. This indicates an increase in the bandgap energy of BaTiO3 with a decrease in crystal sizes. Those onset energies obtained from 90 nm specimen areas showed an excellent agreement with those estimated by previously reported optical measurements. Volume plasmon peaks were observed at 26.5 eV for 34 nm BTNCs and 25 eV for 6 nm BTNCs. Dielectric functions of the BTNCs were derived from loss-functions by Kramers-Kronig analysis using the refractivity of bulk BaTiO3 (= 2.4). The peaks of O 2p → Ti 3d (t2g) transitions in the imaginary part of dielectric function (ε2) were observed at 3.3 eV for 34nm BTNCs and 3.8 eV for 6 nm BTNCs. Those of O 2p → Ti 3d (eg) transitions were at 7.8eV for 34nm BTNCs and 6.6eV for 6nm BTNCs

本文言語English
ページ(範囲)7593-7597
ページ数5
ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
44
10
DOI
出版ステータスPublished - 2005 10月 11

ASJC Scopus subject areas

  • 工学(全般)
  • 物理学および天文学(全般)

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