Abstract
The structure and electrical properties of BiFeO3 ceramics obtained by spark plasma sintering of a nanopowder are investigated. The nanopowder was synthesized by burning of an organic nitrate precursor. The ac conductivity was measured in a frequency range of 1 kHz–10 MHz in a temperature interval of 25–500°C. It is established that the temperature conductivity coefficients above and below ~350°C significantly differ with both alternating and direct currents. The frequency dependence of the conductivity obeys the Jonscher power law σ ~ ωs, where s < 1. The interpretation of this behavior is given in the framework of the model of correlated hops of charge carriers over potential barriers. It is assumed that the hopping mechanism is realized between Fe2+ and Fe3+ ions in ceramic grains. The role of oxygen vacancies in the conduction is also discussed.
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Original Russian Text © S.A. Sadykov, D.K. Palchaev, Zh.Kh. Murlieva, N.M.-R. Alikhanov, M.Kh. Rabadanov, S.Kh. Gadzhimagomedov, S.N. Kallaev, 2017, published in Fizika Tverdogo Tela, 2017, Vol. 59, No. 9, pp. 1747–1753.
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Sadykov, S.A., Palchaev, D.K., Murlieva, Z.K. et al. AC conductivity of BiFeO3 ceramics obtained by spark plasma sintering of nanopowder. Phys. Solid State 59, 1771–1777 (2017). https://doi.org/10.1134/S1063783417090268
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DOI: https://doi.org/10.1134/S1063783417090268