Piezoelectric response of BiFeO3 ceramics at elevated temperatures

Abstract

The high Curie temperature (TC ∼ 825 °C) of BiFeO3 has made this material potentially attractive for the development of high-TC piezoelectric ceramics. Despite significant advances in the search of new BiFeO3-based compositions, the piezoelectric behavior of the parent BiFeO3 at elevated temperatures remains unexplored. We present here a systematic analysis of the converse, longitudinal piezoelectric response of BiFeO3 measured in situ as a function of temperature (25–260 °C), driving-field frequency, and amplitude. Earlier studies performed at room temperature revealed that the frequency and field dependence of the longitudinal response of BiFeO3 is dominated by linear and nonlinear piezoelectric Maxwell-Wagner mechanisms, originating from the presence of local conductive paths along domain walls and grain boundaries within the polycrystalline matrix. This study shows that the same mechanisms are responsible for the distinct temperature dependence of the piezoelectric coefficient and phase angle and thus identifies the local electrical conductivity as the key for controlling the temperature dependent piezoelectric response of BiFeO3 and possibly other, more complex BiFeO3-based compositions.

Enhanced piezoelectric, electrocaloric and energy storage properties at high temperature in lead-free Bi0.5(Na1-xKx)0.5TiO3 ceramics

“…For BNKT 10, the d 33 is increased from 100 pC/N at 20 o C to 125 pC/N at 165 o C, see in Figure 5 (b). Similar phenomena of increased d 33 have been observed in BiFeO 3 -based ceramic[14,44] and PZT5 ceramic[45]. The increased d 33 may be related to the non-180 domain switching induced by internal bias field due to low activation energy at rising temperature.…”

Strengthened relaxor behavior in (1−x)Pb(Fe0.5Nb0.5)O3–xBiFeO3

“…On the other hand, BFO shows ferroelectric behavior at room temperature and is also considered a high-temperature piezoelectric material due to its extremely high T C . 13 What about the PFN-BFO solid solutions? Are they showing more ferroelectric-or relaxor-like behaviors at room temperature?…”

Field cycling‐induced evolution of functional properties in bismuth samarium ferrite ceramics

“…This could further affect the electromechanical properties of BiFeO 3 ‐based systems through, for example, the piezoelectric Maxwell‐Wagner effect . The previous in situ converse piezoelectric response of BiFeO 3 at elevated temperatures confirmed the existence of this effect . Unfortunately, comparable piezoelectric measurements at higher temperatures over T N are lacked.…”