Fizika Tverdogo Tela, 2025 Volume 67, Issue 9,Pages 1691–1699(Mi ftt12255)
Magnetism, spintronics
Effect of electrical and temperature conditions on the thermal expansion of Ba$_{0.97}$Bi$_{0.02}$TiO$_3$ ceramics in the $Pm\bar3m\leftrightarrow P4mm$ phase transition region
Abstract:
The influence of various combinations and conditions of the electric field and temperature on the thermal expansion of Ba$_{0.97}$Bi$_{0.02}$TiO$_3$ ceramics in the region of the ferroelectric phase transition $Pm\bar3m\leftrightarrow P4mm$ was studied. The sequence of thermal/electrical processes required to obtain reliably reproducible results during thermal cycling has been established. The possibility of targeted variation within the limits of $\sim$ (20 – 30)% of the values both of the anomalous thermal expansion coefficient and deformation near and far from the transition temperature, respectively, is shown, which can undoubtedly be used at the stage of developing ceramic elements for miniature electromechanical devices.
Keywords:phase transitions, ferroelectrics, thermal expansion, electric field.
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