Realizing Excellent Electromechanical Coupling Performance in BiScO3-Bi(Zn2/3Nb1/3)O3-PbTiO3 Ternary High-Temperature Perovskite Ceramics
Journal of the European Ceramic Society(2024)
摘要
Large piezoelectric voltage coefficient (g33) and figure of merit (FOM33) are the key parameters of perovskite ceramics for piezoelectric sensors and energy harvesters. Here, the Bi(Zn2/3Nb1/3)O3 (BZN) member with a low tolerance factor is introduced into the BiScO3-PbTiO3 (BS-PT) perovskite high-temperature piezoelectric matrix to decouple the piezoelectric coefficient (d33) and dielectric constant (epsilon r) by modulating the morphotropic phase boundary and grain size. For the optimal 0.38BS-0.01BZN-0.61PT ceramic that benefits from the decoupling of d33 and epsilon r, its Curie temperature, g33 and FOM33 are as high as 436 degrees C, 38.6 mV & sdot;m & sdot;N1 and 16.5x1012 m2 & sdot;N1, respectively. Furthermore, the 0.38BS-0.01BZN-0.61PT ceramic also shows the technical advantages of large g33 and FOM33 even at harsh elevated temperatures (>= 200 degrees C). Due to its outstanding comprehensive performances above, the 0.38BS-0.01BZN-0.61PT ceramic surpasses many other BS-PT-based piezoceramics. These results demonstrate that the 0.38BS-0.01BZN-0.61PT material is a promising competitor for high-temperature electro-mechanical coupling applications.
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关键词
BiScO3-PbTiO3,Piezoceramic,Phase structure,Grain size,Electromechanical coupling performance
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