The electrostriction and strain response of lead‐free Bi_0.5Na_0.5TiO₃–BaTiO₃ piezoceramics with La and Nb [(Bi_0.47Na_0.47Ba_0.06)_1−xLa_xTi_1−yNb_yO₃] were modified by optimizing the depolarization temperature. The influences of La and Nb on their phase structure and electrical properties were systematically investigated. All the ceramics exhibited a pseudocubic phase, which is independent of the addition of La and Nb. The strain values increased gradually with the addition of La, and a high strain of ~0.5% (80 kV/cm) was attained without any remnant strain when the compositions had a value of x = 0.015. Instead, the piezoelectric constant d₃₃ dropped down ~20 pC/N due to the shift of the T_d (or T_f−r) to room temperature. Interestingly, by establishing the relationship between T_d and strain values, it should be feasible to optimize the strain property of Bi_0.5Na_0.5TiO₃ (BNT)‐based ceramics by regulating T_d to ambient temperature. In addition, a very high electrostriction coefficient Q₃₃ of ~0.0758 m⁴ C⁻² can be found under high temperatures of 125 and 150°C. We believe that the strain and electrostriction behavior of BNT‐based ceramics can be well modified by the modulation of depolarization temperature.

中文翻译：

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钛酸铋钠基陶瓷中电致伸缩和应变响应的调制

La和Nb [（Bi _0.47 Na _0.47 Ba _0.06）_{1- x} La _x Ti _{1- y} Nb _y O ₃的无铅Bi _0.5 Na _0.5 TiO ₃ -BaTiO ₃压电陶瓷的电致伸缩和应变响应通过优化去极化温度来修饰]。系统地研究了La和Nb对它们的相结构和电性能的影响。所有陶瓷均表现出假立方相，这与La和Nb的添加无关。当添加La时，应变值逐渐增加，并且当x值为0.015时，获得了〜0.5％（80 kV / cm）的高应变，而没有任何残余应变。相反，由于T _d（或T _f-r）向室温的移动，压电常数d ₃₃下降了〜20 pC / N。有趣的是，通过建立T _d之间的关系和应变值，通过将T _d调节至环境温度来优化Bi _0.5 Na _0.5 TiO ₃（BNT）基陶瓷的应变性能应该是可行的。另外，在125和150℃的高温下可以发现〜0.0758 m ⁴ C ^-2的非常高的电致伸缩系数Q ₃₃。我们认为，通过调节去极化温度，可以很好地改变BNT基陶瓷的应变和电致伸缩行为。