Critical size and anomalous lattice expansion in nanocrystalline particles

S. Tsunekawa, S. Ito, T. Mori, K. Ishikawa, Z. Li, Y. Kawazoe

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

Nanocrystalline barium titanate particles are prepared by the alkoxide method. The lattice constants are obtained from the electron diffraction patterns for various orientations of single particles in the size range of 15-250 nm in diameter. The present result indicates that the structural change from a tetragonal (ferroelectric) phase to a cubic (paraelectric) one occurs around 80 nm in diameter, which is in good agreement with a critical diameter recently reported. Large lattice expansions of more than 2.5% are detected in the particles down to 15 nm in diameter. The origin of the expansion is discussed on the basis of x-ray photoelectron spectroscopic analyses and a computer simulation.

Original languageEnglish
Pages (from-to)3065-3070
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number5
DOIs
Publication statusPublished - 2000 Jan 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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