Nanoscale Effects on the Stability of the lambda-Ti3O5 Polymorph

作者：Makiura Rie^*; Takabayashi Yasuhiro; Fitch Andrew N; Tokoro Hiroko; Ohkoshi Shin ichi; Prassides Kosmas

来源：Chemistry-An Asian Journal, 2011, 6(7): 1886-1890.

DOI：10.1002/asia.201100125

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

The nanocrystalline valency-delocalized lambda-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-lambda to monoclinic charge-ordered beta-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.

• 出版日期2011-7-4