Search academic texts

Information × Registration Number 0224U032923, (0124U003896) , R & D reports Title Silicon-compatible ferroelectric nanocomposites for electronics and sensors popup.stage_title Виготовлення нано-розмірних та наноструктурованих сегнето-електриків (СЕ) і кремній-сумісних сегнетоелектричних нанокомпозитів (КССК). Моделювання фазових діаграм, сегнето-електричних (СЕ), п’єзоелектричних (ПЄ), піро-електричних (ПЕ) та електро-калоричних (ЕК) властивостей СЕ та КССК Head Yelisieiev Yevhen A., Доктор фізико-математичних наук Registration Date 11-12-2024 Organization Frantsevich Institute for Problems of Materials Science National Academy of Science of Ukraine popup.description1 Development of high-quality silicon-compatible ferroelectric micro-, meso- and nano-composites for nanoelectronics and sensors, as well as prototypes of devices based on them with significantly improved coefficients of piezoelectric, pyroelectric, and/or electrocaloric conversion, and ultra-short response time to temperature and/or pressure changes popup.description2  Silicon-compatible ferroelectric nanocomposites (SСFN) with quasi-spherical shape of hafnium-zirconium oxide nanoparticles with rare-earth impurities of yttrium, oxygen vacancies and without them, high content of orthorhombic structural phase and wide stoichiometry were synthesized. The initial ferroelectrics and the corresponding SСFN were characterized using X-ray diffraction spectra and microscopic images. Test measurements of the SСFN capacitance, current-voltage characteristics and ferroelectric properties, including pyroelectric ones, were carried out. Radiospectroscopy methods (EPR and NMR) were used to clarify the local structure and change the symmetry depending on the size of ferroelectric nanoparticles and/or nanograins. The EPR results allowed us to identify different structural phases in BaTiO3 and HfxZr1-xO2 nanoparticles depending on temperature, chemical composition and size. Comprehensive theoretical studies of size effects of phase diagrams, polar and dielectric properties of BaTiO3 nanoparticles and silicon-compatible HfxZr1-xO2 nanoparticles, ferroelectric-antiferroelectric Bi1-xSmxFeO3 nanoparticles and bilayer Zn1-xMgxO nanostructures were carried out. Numerical modeling was performed using the finite element method. An analytical approach based on the Landau-Ginsburg-Devonshire theory and a direct variational method were applied to predict the influence of size effects on phase diagrams, domain structure, dielectric and polar properties of micro- and nanoscale ferroelectrics. The proposed combination of methods allowed us to obtain the necessary information for the characterization of nanoparticles and nanocomposites, to establish the influence of the external electric field, synthesis conditions, and the size of ferroelectric nanoparticles, nanograins, and/or nanoclusters in nanocomposites on their performance characteristics. Product Description popup.authors Yelisieiev Yevhen A. Volnianskyi Мykhaylo D Diachenko Anna O. Zahorodnii Yurii О. Kondakova Iryna V. Koptiev Mykhailo M. Yurchenko Lesia Р. popup.nrat_date 2024-12-11 Close