Speaking of ceramics it, we all know very well, from ancient times to modern times, ceramics all the time does not exist around us, we are in the home furnished with ornamental porcelain, construction of high-rise buildings with ceramic tiles, including our usual meals with ceramic bowls, our lives are full of ceramics, of course, today, I say piezoelectric ceramics, a considerable part of the people will ask, what is the piezoelectric ceramics, what is it used for? Well today, I will tell you what is piezoelectric ceramics parameters.
Piezoelectric ceramics is a kind of information that can convert mechanical and electrical energy to each other functional ceramic materials - piezoelectric effect, piezoelectric ceramics in addition to piezoelectricity, ? Also has dielectricity, elasticity, etc.,? Has been widely used in medical imaging, acoustic sensors, acoustic transducers, ultrasound motors. Piezoelectric ceramics use its material in the mechanical stress, caused by the relative displacement of the internal positive and negative charge center polarization occurs, resulting in the appearance of the opposite sign of the material at both ends of the surface of the bound charge that is the piezoelectric effect and the production of sensitive characteristics, piezoelectric ceramics are mainly used in the manufacture of ultrasonic transducer, hydroacoustic transducer, electroacoustic transducer, ceramic filter, ceramic transformer, ceramic discriminators, high-voltage generator, infrared Detectors, surface acoustic wave devices, electro-optical devices, ignition and detonation devices and piezoelectric gyroscope, etc. In addition to high-tech fields, it is more in the daily life of people to serve people, for people to create a better life and efforts.
Free dielectric constant εT33
The dielectric constant of a dielectric at zero (or constant) strain in farads/meter.
Relative dielectric constant εTr3 (relative?permittivity)
The ratio of the dielectric constant εT33 to the vacuum dielectric constant ε0, εTr3 = εT33/ε0, which is a factorless physical quantity.
Dielectric loss (dielectric?loss)
Dielectric under the action of the electric field, due to the electrode relaxation process and leakage conduction and other reasons in the dielectric loss of energy.
Loss angle tangent tgδ
Ideal dielectric in sinusoidal alternating electric field under the action of the current than the voltage phase ahead of 90?0, but in the piezoelectric ceramic specimen due to energy loss, the current ahead of the phase angle ψ is less than 900, and it's the residual angle δ (δ + ψ = 900) known as the loss angle, which is an unfactored physical quantities, people usually use loss angle tangent tgδ to represent the dielectric loss. δ to indicate the magnitude of dielectric loss, which represents the ratio of active power (loss power) P to reactive power Q of the dielectric. That is: ? Electrical Quality Factor Qe
The value of the electrical quality factor is equal to the reciprocal of the tangent of the loss angle of the specimen, expressed in terms of Qe, which is a factorless physical quantity. If the parallel equivalent circuit represents the alternating electric field in the piezoelectric ceramic specimen, then ?Qe = 1 / ?tgδ = ωCR
Well, the above, that is, about the piezoelectric ceramic parameters of the whole content, in general, such as piezoelectric ceramics such as the need for professionals to complete the work of the personal guidance of the rest of it, you can occasionally fumble a little bit, but the old generations of people say good, we should live to learn old, we should live to learn old, we should live to learn old. We should live to learn old, human life is in the learning progress, I suggest that, want to learn piezoelectric ceramics parameters of friends can often drill Oh.
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