Y. Sung, J. Cho, T. Song, S. Jeong, J. Song, M. Kim
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Composition Dependent Piezoelectric Properties of Pb-free (Bi0.o5N0o 5)1-x) BaxTiO3 Ceramics
An optimum composition for maximizing piezoelectric properties of (Bi0.5Na0.5)(1-x)BaxTiO3 ceramics was investigated within the range of x=0-0.1 covering rhombohedral to tetragonal phase regions of the system. A perovskite structure with two different crystal symmetries depending on the Ba content was formed with no impurity phases. A range of morphotropic phase boundary dividing rhombohedral and tetragonal phase regions was found to exist at x=0.05~0.08. As for piezoelectric properties the piezoelectric constant (d33) and the electromechanical coupling factor (Kp) showed a peak value at x=0.065 within the range tested, which was 192 pC/N and 34%, respectively, implying x=0.065 as an optimum composition for piezoelectric (Bi0.5Na0.5)(1-x)BaxTiO3 ceramics.
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