Up-and-Comers to Watch in the Piezoelectric Transducer Industry

Ultrasonic piezoceramic pickup is also an effective method for modification of bismuth layered structure ceramics. Generally, substitution at A and B positions can achieve certain effects. Such as adding PbO2 in PbBi4Ti4O15 CeO2 can improve the resistance of the material. The addition of Cr2O3 and MoO3 in Bi3TiNbO9 can improve the piezo transducer datesheet. At the same time in the A, B-bit to be replaced, but also to achieve the purpose of improving the piezoelectric activity. In Bi3TiNbO9 system, Ti5 +, W6 + or Ta5 + can be used to replace Nb5 + in B site, and the piezoelectric coefficient d33 can be increased from 5 pC / N to 24 pC / N instead of Bi3 +by what kind of modification, high intensity piezoelectric piezometer is the bismuth layered structure itself, the piezoelectric coefficient of the piezoelectric ceramic system can not be essentially improved. This limits the bismuth layered ceramic structure in the drive and other applications. Perovskite structure system of pickup piezo transducer is the most common ferroelectric ceramics, is also the most widely used class.The chemical formula is ABO3, AB valence of A2 + B4 +, A3 + B3 + or A1 + B5 +. The perovskite structure can be described by a simple cubic lattice, with each lattice point representing one of the structural motifs shown, apparently also a chemical unit. The apex of ultrasonic plate transducer is occupied by a larger A ion, the body center is occupied by a smaller B ion, and the six facets are occupied by O ions. These oxygen ions form oxygen octahedron, B ion in the center, the entire crystal can be seen as a total octahedron connected by the oxygen, the oxygen octahedra between the space occupied by the A ions. Generally, the coordination numbers of A and B are 12 and 6, respectively. Oxygen octahedron of  piezoelectric transducer materials has three quadruplets, four triplets and six doublets. Its main spontaneous polarization comes from the movement of B ions away from the octahedral center.