Sadykov S. A.1,2, Kallaev S. N.2, Emirov P. M.1, Alikhanov N. M. R.1,2
1Dagestan State University, Makhachkala, Dagestan Republic, Russia
2Amirkhanov Institute of Physics, Daghestan Federal Research Center, Russian Academy of Sciences, Makhachkala, Russia
Email: alihanov.nariman@mail.ru
The results of a study of the electrical properties of ceramics Bi1-xSmxFeO3 (x=0.05-0.20), synthesized by the technology of spark plasma sintering of nanopowder, are presented. X-ray diffraction (XRD) showed a change in the structure of bismuth ferrite from rhombohedral to orthorhombic with increasing samarium concentration. It has been found that the substitution of samarium improves the dielectric properties of εr and δ, while the doped bismuth ferrite in the orthorhombic Pbam and Pnma phases has higher dielectric permittivity values than in the rhombohedral R3c phase. A decrease in leakage currents with increasing Sm concentration at temperatures up to 300oC was found. Near the Neel temperature, all Bi1-xSmxFeO3 compositions demonstrate a decrease in the temperature growth rate σac. An analysis of the frequency dependence of the conductivity σac(ω) at different temperatures was carried out based on the universal power law of Johnsher σ~ωs. Keywords: BiFeO3, ceramics, dielectric properties, ac-conductivity, crystal structure.
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