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

doi:10.1002/asia.201100125

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

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

18 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 language	English
Pages (from-to)	1886-1890
Number of pages	5
Journal	Chemistry - An Asian Journal
Volume	6
Issue number	7
DOIs	https://doi.org/10.1002/asia.201100125
Publication status	Published - 2011 Jul 4

Keywords

hysteresis
nanoscale effects
polymorphism
structural transitions
x-ray diffraction

ASJC Scopus subject areas

Biochemistry
Organic Chemistry

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title = "Nanoscale effects on the stability of the λ-Ti3O 5 polymorph",

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.",

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AU - Makiura, Rie

AU - Takabayashi, Yasuhiro

AU - Fitch, Andrew N.

AU - Tokoro, Hiroko

AU - Ohkoshi, Shin Ichi

AU - Prassides, Kosmas

PY - 2011/7/4

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AB - 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.

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