Nanoscale effects on the stability of the λ-Ti3O 5 polymorph

Rie Makiura, Yasuhiro Takabayashi, Andrew N. Fitch, Hiroko Tokoro, Shin Ichi Ohkoshi, Kosmas Prassides

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

The nanocrystalline valency-delocalized λ-phase of the binary oxide Ti3O5 has recently emerged as a promising phase-change material that exhibits rapid photo-reversible optical and resistance changes at ambient temperature. Nanoscaling caused the monoclinic-λ to monoclinic charge-ordered β-phase structural instability to shift to considerably lower temperatures compared to the bulk material, and led to a broad thermal hysteresis. The structural transformation was accompanied by a large change in volume and large lattice relaxations, which imply the presence of strong electron-phonon coupling. We attribute the suppression of the phase transition to the enhanced surface energy on the nanoscale.

Original languageEnglish
Pages (from-to)1886-1890
Number of pages5
JournalChemistry - An Asian Journal
Volume6
Issue number7
DOIs
Publication statusPublished - 2011 Jul 4

Keywords

  • hysteresis
  • nanoscale effects
  • polymorphism
  • structural transitions
  • x-ray diffraction

ASJC Scopus subject areas

  • Biochemistry
  • Organic Chemistry

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    Makiura, R., Takabayashi, Y., Fitch, A. N., Tokoro, H., Ohkoshi, S. I., & Prassides, K. (2011). Nanoscale effects on the stability of the λ-Ti3O 5 polymorph. Chemistry - An Asian Journal, 6(7), 1886-1890. https://doi.org/10.1002/asia.201100125