The present invention is a piezoelectric composition and a piezoelectric element using the piezoelectric composition, the composition being characterized by: having a Perovskite structure represented by general formula ABO3; being represented by composition formula x(Bi0.5K0.5)TiO3-yBi(Mg0.5Ti0.5)O3-zBiFeO3, x+y+z=1 in the composition formula above; and in a triangular coordinate using x, y and z in the composition formula above, having a composition represented by a region which is surrounded by a pentagon ABCDE with apexes of point A (1, 0, 0), point B (0.7, 0.3, 0), point C (0.1, 0.3, 0.6), point D (0.1, 0.1, 0.8) and point E (0.2, 0, 0.8) and which does not include the line segment AE that connects point A (1, 0, 0) and point E (0.2, 0, 0.8).

Processes and machines suitable for producing polymer films, and films produced thereby. Lead zirconate titanate (PZT) particles and electrically conductive nanoparticles are combined in a liquid polymer precursor matrix and aligned along nanocolumns in a thickness direction of the polymer precursor matrix by subjecting the PZT and nanoparticles to a uniform electric field, after which the polymer precursor matrix is solidified to form a piezoelectric polymer composite film. The PZT and nanoparticles are subjected to the uniform electric field for a duration sufficient to promote sensitivity and/or energy harvesting properties of the piezoelectric polymer composite film.

The invention relates to a method for manufacturing a sensor element or an active component of a sensor element. The sensor element is applied in a field device of automation technology. The method comprises the following method steps: predetermining at least two materials with different physical and chemical properties depending on a functionality of the sensor element or the active component of the sensor element; predetermining an outer shape, into which the at least two materials should be formed, the outer shape being divided into a plurality of virtual spatial regions, wherein in each virtual spatial region the material distribution of the at least two materials occurs homogeneously and periodically according to predetermined rules corresponding to a microstructure. The method also includes steps of ascertaining the predetermined rules via a computer supported method depending on the predetermined functionality of the sensor element or the active component of the sensor element.

An embodiment piezoelectric element includes a piezoelectric composite layer including a polymer and a piezoelectric ceramic, a backing layer disposed on a rear surface of the piezoelectric composite layer and configured to limit vibration of the piezoelectric composite layer, and an adhesive layer bonding the piezoelectric composite layer and the backing layer.

Methods of producing lead-free piezoelectric composites are described. The method can include adding a lead-free piezoelectric additive to a solution that includes a solvent and polymer solubilized therein. The solvent can have i) a boiling point ≤80° C. at 0.1 MPa and ii) a solubility in water of ≥0.1 g/g and/or a dielectric constant ≥20. The solvent can be removed to form a polymeric matrix having the lead-free piezoelectric particles dispersed therein. Electrical treatment of the polymeric matrix can form the piezoelectric component. Lead-free piezoelectric composites and devices that include the lead-free piezoelectric composites are also described.

A lead-free lithium doped potassium sodium niobate piezoelectric ceramic material in powdered form and having a single crystalline phase and uses thereof are described. Methods of making the said piezoelectric ceramic material are also described.

A piezoelectric sensor (10) having an elongated-sheet shape includes a piezoelectric layer (11) containing an elastomer and piezoelectric particles and electrode layers (12a and 12b) which are disposed with the piezoelectric layer (11) sandwiched between the electrode layers. In the piezoelectric sensor (10), a pressure sensing region (S) has a length of 500 mm or longer in a longitudinal direction thereof; the electrode layers (12a and 12b) contain an elastomer and flaky conductive materials and are capable of elongating by 10% or more in one direction of plane directions; and when a space between one end portion (A) and the other end portion (B) of the pressure sensing region (S) in the longitudinal direction is set as a measurement zone, an electrical resistance in the measurement zone in the electrode layers (12a and 12b) is 3,000Ω or lower, and the specific Expression (I) is satisfied.

A piezoelectric sensor (10) having an elongated-sheet shape includes a piezoelectric layer (11) containing an elastomer and piezoelectric particles and electrode layers (12a and 12b) which are disposed with the piezoelectric layer (11) sandwiched between the electrode layers. In the piezoelectric sensor (10), a pressure sensing region (S) has a length of 500 mm or longer in a longitudinal direction thereof; the electrode layers (12a and 12b) contain an elastomer and flaky conductive materials and are capable of elongating by 10% or more in one direction of plane directions; and when a space between one end portion (A) and the other end portion (B) of the pressure sensing region (S) in the longitudinal direction is set as a measurement zone, an electrical resistance in the measurement zone in the electrode layers (12a and 12b) is 3,000Ω or lower, and the specific Expression (I) is satisfied.

Lead-free piezoelectric composites and methods of making and uses thereof are described. The lead-free piezoelectric composites have high flexibility and high piezoelectric properties.

A technology of fabricating a piezoelectric composite applicable to an ultrasonic transducer is disclosed. According to one aspect of the present disclosure, a support member formed with a plurality of through holes is located on one surface of an electrode plate, and lower surfaces of piezoelectric pillars having shapes respectively corresponding to the through holes are adhered onto the one surface of the electrode plate to form the piezoelectric pillars. Further, according to an additional aspect, the plurality of piezoelectric pillars having shapes corresponding to the through holes of the support member are formed by sintering a piezoelectric pellet molded in a pillar shape.