Based on a study performed by our group at the Electronic Ceramics Department in collaboration with colleagues from China, Germany, Australia, and Switzerland, we have published a paper in the journal of Advanced Functional Materials titled “Piezoelectric properties of BiFeO₃ exposed to high temperatures”. We report on an unusual phenomenon in ferroelectric bismuth ferrite (BiFeO₃). Owing to its high Curie temperature (T_C = 830°C), this ceramic composition has been extensively studied in the recent years, particularly for high-temperature piezoelectric applications. We have discovered that the piezoelectric response, which disappeared at temperatures above ~400°C, was recovered upon cooling of the material. In contrast to the commonly assumed explanation related to thermal depoling of the ceramics and thus permanent loss of piezoelectricity, in this case, it is a reversible phenomenon stemming from the thermally activated electrical conductivity of the ferrite. The discovery of this phenomenon has paved the way for optimizing the poling conditions of BiFeO₃, which may have practical significance in the development of BiFeO₃-related environmentally friendly lead-free piezoceramics.