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Nanoscale Effects on the Stability of the λ‐Ti 3 O 5 Polymorph
Author(s) -
Makiura Rie,
Takabayashi Yasuhiro,
Fitch Andrew N.,
Tokoro Hiroko,
Ohkoshi Shinichi,
Prassides Kosmas
Publication year - 2011
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201100125
Subject(s) - materials science , monoclinic crystal system , nanocrystalline material , valency , nanoscopic scale , delocalized electron , phase (matter) , condensed matter physics , phase transition , chemical physics , crystallography , nanotechnology , crystal structure , chemistry , linguistics , philosophy , physics , organic chemistry
The nanocrystalline valency‐delocalized λ‐phase of the binary oxide Ti 3 O 5 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.