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Dielectric characteristics of heteroepitaxial Sr0.60Ba0.40Nb2O6 thin films grown on a Pt(001)/MgO(001) substrate
Russian version
Makinyan N. V.1,2, Pavlenko A. V. 1,2
1Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
2Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
Email: norair.makinyan@yandex.ru, tolik_260686@mail.ru
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The structure, surface microstructure, dielectric and ferroelectric characteristics of thin films of barium-strontium niobate Sr0.60Ba0.40Nb2O6 (SBN60) grown on a Pt(001)/MgO(001) substrate have been studied. It is shown that the films are unalloyed, monocrystalline, and by the nature of changes in the dielectric permittivity (ε' and ε'') from the temperature and frequency of the measuring electric field, they are relaxor ferroelectrics. It is established that in the investigated film the Burns temperature is 475 K, the Vogel-Fulcher temperature is 367 K, and in the vicinity of T=150 K there is a phase transition between two ferroelectric phases. It is shown that at room temperature, depending on the electric field strength, the prevailing charge transport mechanisms in SBN60 films are Poole-Frenkel emission and space charge limited current. The reasons for the revealed patterns are discussed. Keywords: dielectric characteristics, relaxor ferroelectric, tetragonal tungsten bronze, leakage currents.
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