Search academic texts

Information × Registration Number 0220U103130, 0117U002198 , R & D reports Title Flexoeffect and the structure defects of nano- and macroscopic oxide materials for a new generation of electronic technique popup.stage_title Head Glynchuk Maya D., Доктор фізико-математичних наук Registration Date 17-08-2020 Organization Institute for Problems in Materials Science popup.description2 Using the Landau-Ginzburg-Devonshire theory, we considered the effect of flexoelectrochemical coupling on the dimensional effects in polar properties and phase transitions of thin ferroelectric films with a layer of elastic defects. The results obtained revealed the unexpectedly strong influence of the combined effect of Wegard stresses and the flexoelectric effect on the temperature of the ferroelectric transition, the distribution of spontaneous polarization and elastic fields, the structure and period of the domain wall in thin PbTiO3 films containing a layer of elastic defects. It has been shown that transverse shear surface acoustic waves can expand near the flat surfaces of all crystalline dielectrics due to flexoelectric coupling. The conditions for the appearance of soft acoustic phonon mode in ferroelectrics depending on the magnitude of the flexoelectric coefficient and temperature are investigated. The temperature dependence of the dielectric susceptibility is consistent with experimental data in space-modulated phase ferroelectrics. This makes it possible to predict the existence of flexural coupling of soft acoustic modes in ferroelectrics with space-modulated phase II type. Product Description popup.authors Eliseev Evgen A Zagorodniy Yuriy О Kondakova Iryna V Kuzian Roman O Likhtin Andrіy E Laguta Valentyn V Leshchenko Oksana V Pavlikov Viktor М Pleskach Igor V Roginets Nadiya V Stratiev Victor G Umpeleva Elizaveta D Ushakov Oleksandr M Yurchenko Lesia P popup.nrat_date 2020-10-01 Close