Microstructure and electrical properties of porous BZT-0.5BCT ceramics: Effect of pore formers (PVA and PVP)

Investigation on electric properties of 0.57(Bi0.8La0.2)FeO3‐0.43PbTiO3 porous ceramics prepared by burnable plastic sphere method

“…[5][6][7] Besides, the lower density of porous piezoceramics reduces acoustic impedance Z, leading to the improvement of impedance matching performance between materials and media. [8][9][10][11][12][13][14][15][16] More interestingly, the pores filled with air in porous piezoelectric ceramics lead to a partial decoupling of transverse and longitudinal effects, which increases piezoelectric anisotropy d 33 /d 31 and electromechanical anisotropy k t /k p . 17,18 Underwater acoustic transducers with large piezoelectric anisotropy can effectively suppress the generation of redundant transverse vibration modes, achieving high-resolution emission.…”

“…The introduction of pores in porous piezoelectric ceramics significantly reduces the dielectric constant ε r , which effectively enhances g h ( g h = d h / ε r ) and consequently the hydrostatic figures of merit (HFOM = d h × g h ) of underwater acoustic transducers made of porous piezoceramics that can reach orders of magnitude higher than that of transducers fabricated by dense ceramics 5–7 . Besides, the lower density of porous piezoceramics reduces acoustic impedance Z , leading to the improvement of impedance matching performance between materials and media 8–16 . More interestingly, the pores filled with air in porous piezoelectric ceramics lead to a partial decoupling of transverse and longitudinal effects, which increases piezoelectric anisotropy d 33 / d 31 and electromechanical anisotropy k t / k p 17,18 .…”