V. D. Fokina, M. V. Gorev, V. S. Bondarev, M. S. Molokeev, I. N. Flerov, “Effect of the heterovalent cation substitution Bi$^{3+}$ $\to$ Ba$^{2+}$ in BaTiO3 on the phase transition $Pm-3m\leftrightarrow P4$mm and efficiency of energy harvesting”, Fizika Tverdogo Tela, 2024, Volume 66, Issue 10,Pages 1780

Ferroelectricity

Effect of the heterovalent cation substitution Bi$^{3+}$ $\to$ Ba$^{2+}$ in BaTiO3 on the phase transition $Pm-3m\leftrightarrow P4$mm and efficiency of energy harvesting

V. D. Fokina^a, M. V. Gorev^ab, V. S. Bondarev^ab, M. S. Molokeev^ab, I. N. Flerov^a

^a L. V. Kirensky Institute of Physics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk
^b Institute of Engineering Physics and Radioelectronics, Siberian Federal University, Krasnoyarsk

Abstract: The heat capacity, thermal expansion and sensitivity to change of electric field of ceramic samples BaTiO$_3$ and Ba$_{0.97}$Bi$_{0.02}$TiO$_3$ were studied. The nature of the influence of chemical pressure and electric field on the main parameters of the phase transition $Pm-3m\leftrightarrow P4$mm was revealed. The Olsen thermodynamic cycle was analyzed in the entropy-temperature diagram and the densities of the converted waste heat energy into electrical energy were determined.

Keywords: phase transitions, ferroelectrics, heat capacity, thermal expansion, energy harvesting.

Received: 14.08.2024
Revised: 24.08.2024
Accepted: 25.08.2024

DOI: 10.61011/FTT.2024.10.59085.214