Specific Features of Jahn-Teller Structure Phase Transitions in Nanocrystalline Materials

Anatoly Yakovlevich Fishman; M.A. Ivanov; S.A. Petrova; Nickolai Tkachev; Vladimir Borisovich Vykhodets; Robert Grigorievich Zakharov

doi:10.4028/www.scientific.net/DDF.283-286.53

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Diffusion of Nitrogen in Ti-13V-11Cr-3Al Alloys
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Reduction Kinetics of Iron Ore Materials by Gases
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Specific Features of Jahn-Teller Structure Phase Transitions in Nanocrystalline Materials
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The Influence of Deep Cryogenic Treatment on Precipitation Phenomena during Tempering and Ageing
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Stability of Neutral Silicon Interstitials in 3C- and 4H-SiC: A First-Principles Study
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Elastic Behavior of the Ti-13Nb-13Zr Alloy Obtained by Anelastic Spectroscopy
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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vols. 283-286Specific Features of Jahn-Teller Structure Phase...

Specific Features of Jahn-Teller Structure Phase Transitions in Nanocrystalline Materials

Abstract:

Specific features of the structural phase transitions of the first order were investigated in nanosized crystals with Jahn-Teller ions. As an example the phase transitions of martensite type with changes in symmetry from a cubic to a tetragonal one have been considered. The Kanamori model was used to take into account the size of nanocrystallites and the distribution of cations over non-equivalent crystallographic sublattices in such systems. It was shown the temperature and the latent heat of the transition decrease significantly for the nanoscaled grains. A possibility of multi-phase state for nanocrystalline materials was considered.