High temperature lead-free piezoelectric ceramics 0.67BiFeO₃–0.33BaTiO₃ doped with 0.35 mol% MnO₂ and xBiScO₃ (x = 0, 0.005, 0.01, 0.015, 0.02) were prepared by conventional solid-state sintering method. The effects of BiScO₃ doping on the crystal structure, piezoelectric, ferroelectric and dielectric properties of BiFeO₃-BaTiO₃ piezoelectric ceramics were investigated. The results show that the BiScO₃ doping can not change the crystal structure of the ceramics and the grain size of ceramics increases first and then decreases with the BiScO₃ doping content increasing. The optimum piezoelectric properties d₃₃ = 165 pC/N, k_p = 0.349 and Q_m = 52.132 were obtained when x = 0.01, with the highest remanent polarization P_r = 37.1 μC/cm². The ceramics become normal ferroelectrics determined by temperature spectrum with the increase of x, and the Curie temperature and depolarization temperature of 425 and 408 °C are respectively obtained when x = 0.01. In particular, a small amount of BiScO₃ doping is beneficial to the improvement of the temperature stability. Moreover, a perovskite solid solution forms between the BiScO₃ and BiFeO₃-BaTiO₃ ceramics, which can improve the electrical properties of BF-BT ceramic system.

中文翻译：

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BiScO 3掺杂对BiFeO 3 -BaTiO 3压电陶瓷结构和性能的影响

 通过常规的固态烧结方法制备了掺有0.35 mol％MnO ₂和x BiScO ₃（x = 0、0.005、0.01、0.015、0.02）的高温无铅压电陶瓷0.67BiFeO ₃ –0.33BaTiO ₃。BISCO的影响₃掺杂的晶体结构，的的BiFeO压电，铁电和电介质特性₃ -BaTiO _3个压电陶瓷进行了研究。该结果表明，BISCO ₃掺杂不能改变陶瓷和陶瓷第一增大晶粒尺寸的晶体结构，然后与BISCO减小₃掺杂含量增加。 当x  ＝ 0.01时，获得最佳的压电性质d ₃₃  ＝165pC / N，k _p  ＝ 0.349，Q _m＝ 52.132 ，剩余极化率最高，P _r  ＝37.1μC/ cm ²。随着x的增加，陶瓷成为由温度谱确定的普通铁电体，当x  = 0.01时，分别获得425和408°C的居里温度和去极化温度。特别是少量的BiScO ₃掺杂有利于提高温度稳定性。此外，BISCO之间的钙钛矿固体溶液形式₃和的BiFeO ₃ -BaTiO ₃陶瓷，从而可以提高BF-BT陶瓷系统的电性能。