Influence of the mechanical activation on the structure, dielectric and piezoelectric characteristics of the binary solid solution (1-x)BiFeO3-xBaTiO3 (x=0.29), with bismuth addition
Boldyrev N. A.1, Shilkina L. A.1, Nagaenko A. V.2, Zhidel K. M.1, Reznichenko L. A.1
1Scientific Research Institute of Physics, Southern Federal University, Rostov-on-Don, Russia
2Scientific Design and Technology Bureau “Piezopribor”, Southern Federal University, Rostov-on-Don, Russia
Email: nboldyrev@sfedu.ru, nagaenko@sfedu.ru
Ceramic samples of the binary system (1-x)BiFeO3-xBaTiO3+2 wt.% Bi2O3 (x=0.29) were obtained by the conventional solid-phase reaction method with and without mechanical activation. X-ray diffraction studies revealed that the samples have a pseudocubic crystal structure at room temperature. A diffuse phase transition occurred in the temperature range of (650-800) K. Relaxor-like behavior and the smearing of the phase transition in the studied ceramics can be associated with the presence of non-interacting regions with increased content Bi or Ba, different modulation and crystal lattice symmetry. The grain morphology and dielectric characteristics of the selected solid solutions were investigated. The highest piezoelectric coefficient, ~120 pC/N, was obtained in the mechanically activated ceramics 0.71BiFeO3-0.29BaTiO3+2 wt.% Bi2O3. Keywords: Perovskite multiferroics, dielectric characteristics, piezoelectric characteristics, solid solutions.
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