Abstract
The thermal stability of the piezoelectric properties in BiFeO3 based high-temperature piezoceramics is traditionally investigated through room temperature characterization via thermal annealing measurements, which cannot reflect the actual performance at elevated temperatures. In this work, the microstructures, electrical properties, real-time high-temperature piezoelectric responses and ferroelectric scaling behaviors of 0.7Bi1.05(Fe1-xMgx)O3-0.3BaTiO3 (BFMx-BT) ceramics were studied systematically. Doping with 0.6% Mg resulted in enhanced piezoelectric properties with d33 = 170 pC/N and kp = 0.29 along with a high-temperature stability (Td = 440 °C). With a significant jump near the Td, in situ high temperature piezoelectric responses displayed a distinct behavior different from the ex situ high temperature piezoelectricity. Scaling behaviors were presented by studying the field amplitude and frequency dependence of P-E hysteresis loops areas. The behavior of the real-time high temperature piezoelectricity may provide a new insight into the development of new high-temperature piezoceramics.
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