Abstract
The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of <TEX>$Bi_{0.5}(Na_{0.82}K_{0.18})_{0.5}Ti_{1-x}Ta_xO_3$</TEX> ceramics has been investigated. The Ta doping resulted in a transition from coexistence of ferroelectric tetragonal and rhombohedral phases to an electrostrictive pseudocubic phase, leading to degradations of the remnant polarization, coercive field, and piezoelectric coefficient <TEX>$d_{33}$</TEX>. However, the electricfield-induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of <TEX>$S_{max}/E_{max}$</TEX> = 566 pm/V under an applied electric field 6 kV/mm when 2% Ta was substituted on Ti sites. The abnormal enhancement in strain was attributed to the pseudocubic phase with high electrostrictive constants.
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