Registration Number
0224U032810,
(0124U003757)
, R & D reports
Title
Manyfold-degenerated metastable states of spontaneous polarization in nanoferroics: theory, experiment and perspectives for digital nanoelectronics.
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Метастабільні феро-йонні стани у нанорозмірних багатовісних фероелектриках та анти-фероелектриках.
Head
Morozovska Hanna M., д.ф.-м.н.
Registration Date
05-12-2024
Organization
Institute of Physics of National Academy of Sciences of Ukraine
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The goal of the project is to create multiply degenerate metastable states of spontaneous electrical polarization induced by dimensional effects in nanoferroics; establishing the main regularities of the spatio-temporal evolution of these states in thin films, nanoparticles and nanocomposites of ferroelectrics, ferro-ionics and multiferroics; development of recommendations for the use of multiply degenerate metastable states in digital nanoelectronics.
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The conditions for the emergence of the ferro-ionic state have been found for the case of thin films of the ferroelectric Zn1-xMgxO, nanoparticles of the multiaxial ferroelectric BaTiO3 in media with different electrochemical activities, nanoparticles of the multiaxial ferroelectric-antiferroelectric Bi1-xSmxFeO3, nanoparticles of the uniaxial ferroelectric-antiferroelectric HfxZr1-xO2 with adsorbed ions at the surface, and nanoparticles of the ferroelectric Sn2P2S6 in ionic aqueous solutions. For the first time, the dependence of the conditions for the emergence of a ferro-ionic state of the ferrielectric type and multiply-degenerated metastable labyrinth domain structures on the size of Bi1-xSmxFeO3 and HfxZr1-xO2 nanoparticles, their chemical composition "x", the concentration of adsorbed ions on the surface of the particles, the dielectric properties of the surrounding environment and temperature was found. For the first time, it was found that layers of charged defects of ionic nature at the interfaces lead to the formation of multiply-degenerated metastable states of the "dragon's teeth" type domain structure in thin films of Zn1-xMgxO with a bilayer structure. The analysis of IR spectra and Raman spectra of composites with BaTiO3 and Bi1-xSmxFeO3 nanoparticles was carried out and their correlations with the current-voltage and current-voltage characteristics of nanocomposites were established. It was found that the features of the IR and Raman spectra of Bi1-xSmxFeO3 nanoparticles at x=0,1 and x≥0,15 correspond to phase transitions from the ferrielectric to the antiferroelectric state, and from the antiferroelectric to the nonpolar state, respectively. For the first time, the relaxor-like temperature behavior of the dielectric constant of composites with a BaTiO3 nanoparticle content of more than 25% and the hysteresis current-voltage characteristics of these nanomaterials under certain conditions were experimentally revealed.
Product Description
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Hudenko Yuliia M.
Demianyk Oleh Yu.
Leonenko Yevhen V.
Morozovska Hanna M.
Pylypchuk Oleksandr S.
Ralliev Maksym V.
Olena M. Fesenko
Yaremkevych Andrii D.
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2024-12-05
