Ultra-high d31 anti-chiral negative Poisson’s ratio BaTiO3 ceramics fabricated by vat photopolymerization 3D printing

In this study, the anti-chiral negative Poisson's ratio structure BaTiO 3 piezoelectric ceramics were fabricated by vat photopolymerization 3D printing technology, which obtained an ultra-high transverse piezoelectric coefficient d 31 . Here, we performed uniaxial compressive load simulations and electric field-driven lattice in-plane strain response simulations, which showed an in-plane negative Poisson's ratio of −1 for the BaTiO 3 ceramics. Its strain amplification is about 10 times that of BaTiO 3 bulk material. Using the principle of positive and negative piezoelectric effects, we measured effective transverse piezoelectric coefficients d 31 for different dimensional parameters. The effective transverse piezoelectric coefficient d 31 with a maximum of 599 pm/V was detected at a ligament aspect ratio of 3.6 for the negative Poisson's ratio BaTiO 3 piezoelectric ceramics , which is 7.7 times higher than that of the bulk material. For the prepared hydrophone, test results show that the effective hydrostatic strain constant d h and Hydrostatic Figure of Merit (HFOM) of BaTiO 3 piezoelectric ceramics with a negative Poisson's ratio structure are 29.6 and 808 times higher than those of bulk BaTiO 3 .