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Phase composition, crystal structure, dielectric and ferroelectric properties of Ba2NdFeNb4O15 thin films grown on a Si(001) substrate in an oxygen atmosphere
Pavlenko A. V.
1, Ilyina T. S.1,2, Kiselev D. A.
2, Stryukov D. V.
1
1Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
2National University of Science and Technology MISiS, Moscow, Russia
2National University of Science and Technology MISiS, Moscow, Russia
Email: antvpr@mail.ru, Antvpr@mail.ru, dm.kiselev@gmail.com, strdl@mail.ru
The phase composition, nanostructure, and properties of Ba2NdFeNb4O15/Si(001) multiferroic thin films have been studied by X-ray diffraction analysis, scanning probe microscopy, and capacitance-voltage characteristics analysis. The RF cathode sputtering in an oxygen atmosphere was used for films fabrication. It has been found that the obtained Ba2NdFeNb4O15 films are single-phase, impurity-free, polycrystalline textured (c-oriented), and the out-of-plane strain is 0.8%, which leads to the presence of ferroelectric properties at room temperature. It is shown that the surface roughness of the films is ~ 15.39 nm, the lateral size of the crystallites is ~ 134 nm, and the relative permittivity in the temperature range of -190...150oC is 95-130. The reasons for the revealed regularities are discussed Keywords: multiferroic, dielectric characteristics, ferroelectric, tetragonal tungsten bronze.
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