Abstract
The high-temperature stability of piezoelectric property is an important merit for applications at elevated temperatures. However, understanding the depolarization mechanism is a fundamental issue that remained unclear for decades. In this study, the ex situ depolarization behavior between open-circuited and short-circuited annealed samples is measured for (1–x)Bi0.5Na0.5TiO3–xBaTiO3 (BNT–xBT) ceramics. A unique high temperature polarization stability state with respect to the prominent improvement depolarization temperature is observed for the morphotropic phase boundary (MPB) composition (x = 0.06) with open-circuited annealed samples. It is suggested that this enhancement can be attributed to the alignment of the nanodomains induced by the bias fields.
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