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- Title
Influence of Dimensionality on Phase Transition in VO<sub>2</sub> Nanocrystals.
- Authors
Blagojević, V. A.; Obradović, N.; Cvjetićanin, N.; Minić, D. M.
- Abstract
Hydrothermally synthesized one-dimensional and two-dimensional nanocrystals of VO2 undergo phase transition around 65°C, where temperature and mechanism of phase transition are dependent on dimensionality of nanocrystals. Both nanocrystalline samples exhibit depression of phase transition temperature compared to the bulk material, the magnitude of which depends on the dimensionality of the nanocrystal. One-dimensional nanoribbons exhibit lower phase transition temperature and higher values of apparent activation energy than two-dimensional nanosheets. The phase transition exhibits as a complex process with somewhat lower value of enthalpy than the phase transition in the bulk, probably due to higher proportion of surface atoms in the nanocrystals. High values of apparent activation energy indicate that individual steps of the phase transition involve simultaneous movement of large groups of atoms, as expected for single-domain nanocrystalline materials.
- Subjects
PHASE transitions; NANOCRYSTALS; VANADIUM oxide; TEMPERATURE effect; BULK solids
- Publication
Science of Sintering, 2013, Vol 45, Issue 3, p305
- ISSN
0350-820X
- Publication type
Article
- DOI
10.2298/SOS1303305B