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The effect of Ta substitution on the crystal structure, ferroelectric, and piezoelectric properties of Bi0.5(Na0.82K0.18)0.5Ti₁₋ₓTaₓO₃ 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 d₃₃ . However, the electricfield-induced strain was significantly enhanced by the Ta substitution-induced phase transition and reached a highest value of Sₘₐₓ/Eₘₐₓ = 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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Do et al. (2011) studied this question.
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