Abstract
High-temperature 0.71 Bi(Fe1−x Ga x )O3–0.29 BaTiO3 (x = 0, 0.01, 0.015, 0.02, and 0.025) piezoelectric ceramics have been synthesized and their structure and electric properties have been investigated systemically. The Ga addition caused insignificant change of crystal structure. However, the addition of a small amount of Ga was quite effective to increase the grain size, densification, and piezoelectric properties. For the ceramics with x = 0.015, the maximum of piezoelectric constant (d 33), and electromechanical coupling factor (k p) are d 33 = 157 pC/N, k p = 0.326, respectively. Meanwhile, the increasing Curie temperature (T c), 467 °C, was obtained with x = 0.02 ceramics. Both remanent polarization P r and coercive field E c were reduced with increasing x.
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