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.

• Periodical: Defect and Diffusion Forum (Volumes 283-286)
• Pages: 53-58
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.283-286.53
• Online since: March 2009
• Authors: Anatoly Yakovlevich Fishman, M.A. Ivanov, S.A. Petrova, Nickolai Tkachev, Vladimir Borisovich Vykhodets, Robert Grigorievich Zakharov
• Keywords: Crystal Random Field, Entropy Jump, Jahn-Teller Ion, Latent Heat, Nano-Sized Crystal, Phase Disintegration Process, Structural Phase Transition

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