Piezoelectric Properties Of Ceramics Research Articles

Pyroelectric properties and applications of piezoelectric PLZT ceramics

Abstract Pyroelectric and dielectric properties of piezoelectric ceramics have been studied in the broad temperature range 293–483 K. The effect of gamma (γ)-irradiation on the pyroelectric coefficient and figure of merit of piezoceramic samples has been examined for the smeared phase transition region. The results obtained are discussed in the framework of the model of “quasiferroelectricity.” It is shown that PLZT-6 type piezoceramics produce stable performance pyroelectric devices when exposed to large γ-irradiation doses.

Fabrication of Grain-Oriented PZT Ceramics from a Hydrothermally Synthesized Powder

The grain-oriented PZT ceramics were fabricated by tape-casting method using powders synthesized by a hydrothermal reaction, and the piezoelectric properties of ceramics were measured. Cyclohexanone was the most suitable solvent from the view point of dispersion of PZT powder in a slurry, and the addition of 100mg/g-PZT of an acrylic binder was necessary for disperson and strength of the tape before sintering. It was possible to fabricate green tapes in which PZT grains having a cubic shape were oriented along a- or c-axis. However, the degree of grain-orientation decreased considerably by sintering. The electromechanical coupling factor (k31) and piezoelectric constant (-d31) of the grain-oriented PZT ceramics were about 10% higher than those of ceramics fabricated by an ordinary procedure using a hydrothermally synthesized powder.

Piezoelectric properties of sol-gel-derived samarium-dysprosium-modified lead titanate ceramics

Samarium- and dysprosium-modified lead titanate ceramics have been prepared by a sol-gel route to utilize the finer control of the process on homogeneity and microstructure. By varying the sintering schedule (temperature and time) for samarium-modified PbTiO3, ceramics with grain sizes ranging from submicrometre to 4 μm have been prepared. The dielectric and piezoelectric properties of ceramics poled sequentially from 0 to 60 kV cm−1 are reported. The dependence of the electromechanical properties on grain size and poling conditions is discussed. It is shown that dysprosium behaves very differently to samarium, and the successful insertion of dysprosium into the Pb2+ sites to produce true dysprosium-modified PbTiO3 ceramics was not possible.

Suggestion of dynamic measurements of properties of piezoelectric ceramics with use of two samples

Abstract The probleme of measuring all matrix elements for the description of all electromechanical properties of piezoelectric ceramics is solved by the method based en measuring the properties of two samples in the shape of rectangular plates with the different types of polarisation.

Electrical Properties of Grain-Oriented Ba and La Modified Lead Niobate Ceramics from Molten Salt Synthesized Powders

Needle-shaped (Pb1-xBax)1-yLa2y/3Nb2O6 powders are prepared in the presence of molten slat, and one directional grain-oriented ceramics are made from these powders by two-stage hot-pressing technique. The morphology of powder and the dielectric and piezoelectric properties of ceramics are also examined. The obtained grain-oriented ceramics have a large anisotropy in both permittivity and coupling factor depending on the first and second hot-pressing directions. The substitution of Ba or La has remarkable effect not only on morphology of the powder but on electrical properties of the ceramics.

Effect of rare-earth oxide on the properties of piezoelectric ceramics

Abstract The influence of rare-earth oxide on the Sr0.02Pb0.98(Li0.008W0.012Ti0.46Zr0.52)O3 composition is studied. The ion size of rare-earth oxide are between those of Pb2+ and Zr4+, so both A-and B-sites are occupied for the same kind of doping. By the weight change method and lattice parameter variation method, the percent substitution of each kind doping can be calculated. For the lanthanum series, La3+, Nd3+ favor to the production of A-site vacancy, and Er3+ favor to the production of O-site vacancy. The piezoelectric properties of each kind of doping were measured too.

Properties of piezoelectric ceramics in the solid-solution series lead titanate-lead zirconate-lead oxide: Tin oxide and lead titanate-lead hafnate

Properties of piezoelectric ceramics in the solid-solution series lead titanate-lead zirconate-lead oxide: Tin oxide and lead titanate-lead hafnate