AC conductivity of BiFeO3 ceramics obtained by spark plasma sintering of nanopowder

作者：Sadykov S A^*; Palchaev D K; Murlieva Zh Kh; Alikhanov N M R; Rabadanov M Kh; Gadzhimagomedov S Kh; Kallaev S N

来源：Physics of the Solid State, 2017, 59(9): 1771-1777.

DOI：10.1134/S1063783417090268

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 25-500A degrees C. It is established that the temperature conductivity coefficients above and below similar to 350A degrees C significantly differ with both alternating and direct currents. The frequency dependence of the conductivity obeys the Jonscher power law sigma similar to omega (s) , 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.

• 出版日期2017-9