Mitarov R.G.1, Kallaev S. N.2, Omarov Z. M.2, Abdulvakhidov B. K.3, Abdulvakhidov K.G.4
1Dagestan State Technical University, Makhachkala, Russia
2Amirkhanov Institute of Physics, Daghestan Federal Research Center, Russian Academy of Sciences, Makhachkala, Russia
3Dagestan State University, Makhachkala, Dagestan Republic, Russia
4Southern Federal University, Rostov-on-Don, Russia
Email: kallaev-s@rambler.ru
The temperature dependence of the heat capacity of mechanically activated BiFeO3 ceramics was studied in the temperature range of 120-800 K. It was shown that the excess heat capacity of the mechanically activated ceramics is due to the following factors: dislocations, thermal generation of point defects, energy levels associated with polar displacements of iron and bismuth ions and with a change in the angle between the oxygen octahedra of FeO6, size effects and an increase in the surface. Keywords: multiferroics, heat capacity, bismuth ferrite, Schottky heat capacity, mechanically activated ceramics.
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