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Microstructure, dielectric and ferroelectric characteristics of 0.1BiFeO3-0.9PbFe0.5Nb0.5O3 multiferroic ceramics at temperatures of 10-850 K
Pavlenko A. V.
1,2, Zhidel K. M.
1
1Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
2Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
2Federal Research Center Southern Scientific Center of the Russian Academy of Sciences, Rostov-on-Don, Russia
Email: karinagidele@gmail.com
The microstructure, dielectric, ferroelectric and piezoelectric characteristics of the multiferroic ceramics 0.1BiFeO3-0.9PbFe0.5Nb0.5O3 have been studied. It is shown that ceramics are impurity-free and have a homogeneous grain structure. When analyzing the ε'(T,f) and ε''(T,f) dependences of the sample at T=(10-850) K, it was found that 0.1BiFeO3-0.9PbFe0.5Nb0.5O3 is a relaxor ferroelectric; a magnetodielectric effect appears during the magnetic phase transition, and at T>450 K, a significant contribution to the dielectric response begins to be made by the Maxwell-Wagner polarization and the corresponding dielectric relaxation. It was revealed that at room temperature, 0.1BiFeO3-0.9PbFe0.5Nb0.5O3 ceramics, unlike BiFeO3 and PbFe0.5Nb0.5O3, is characterized by high values of the real part of the complex permittivity, ε'~9000, dielectric controllability, K~40 % and a piezoelectric coefficient, d33~340 pm/V. Keywords: solid solutions, dielectric controllability, ferroelectric relaxor, Maxwell-Wagner polarization.
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