Realizing excellent electromechanical coupling performance in BiScO3-Bi (Zn2/3Nb1/3)O3-PbTiO3 ternary high-temperature perovskite ceramics

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.