What are the main characteristic parameters of piezoelectric materials? The characteristics of three piezoelectric materials are compared.

The main characteristic parameters of piezoelectric element materials and the characteristics of the three materials are as follows:

Main characteristic parameters of piezoelectric materials:

Piezoelectric constant: Piezoelectric constant is a parameter to measure the piezoelectric effect of materials and is directly related to the sensitivity of piezoelectric output.

Elastic constant: The elastic constant and stiffness of piezoelectric materials determine the natural frequency and dynamic characteristics of piezoelectric devices.

13. Dielectric constant: For a piezoelectric element with a certain shape and size, its inherent capacitance is related to the dielectric constant; Intrinsic capacitance affects the lower frequency limit of piezoelectric sensor.

2. Mechanical coupling coefficient: In the piezoelectric effect, its value is equal to the square root of the ratio of converted output energy to input energy, which is an important parameter to measure the electromechanical energy conversion efficiency of piezoelectric materials.

The characteristics of the three materials are as follows:

The timely crystal, which was studied earlier in piezoelectric materials, has stable electromechanical properties and no internal friction. Widely used in frequency stabilizers, speakers, telephones, clocks and other fields. In addition, crystals such as potassium sodium tartrate, dihydroamine phosphate, lithium tantalate, lithium niobate and lithium iodate are also good piezoelectric crystal materials.

Piezoelectric semiconductor materials mainly include IIB~VIA compounds such as CdS, CdSe, ZnO, ZnS, ZnTe, CdTe, and III ~ V compounds such as GaAs, GaSb, InAs, InSb, AIN. At present, CdS, CdSe and ZnO are the most widely used in micro-acoustic technology.

Piezoelectric ceramic materials mainly include barium titanate (BaTiO3), lead titanate (PbTiO3) and lead zirconate titanate.

Substantive principle:

Manufacturers hide piezoelectric ceramics in this piezoelectric ignition device. When the user presses the spring of the ignition device, the transmission device exerts pressure on the piezoelectric ceramics to generate high voltage, and then leads the electric energy to the gas outlet for discharge. As a result, the gas was ignited by the electric spark. This function of piezoelectric ceramics is called piezoelectric effect.

The principle of piezoelectric effect is that if pressure is applied to piezoelectric materials, potential difference will be generated, otherwise mechanical stress will be generated. If the pressure is a kind of high-frequency vibration, it will produce high-frequency current. When high-frequency electrical signals act on piezoelectric ceramics, high-frequency acoustic signals will be generated, which is what we usually call ultrasonic signals.

That is to say, piezoelectric ceramics have the function of conversion and inverse conversion between mechanical energy and electrical energy, and the corresponding relationship between crystal materials during electric response is really interesting.