Views: 3 Author: Site Editor Publish Time: 2019-07-24 Origin: Site
About piezoelectric ceramics, it is generally made of PZT-4 piezoelectric ceramic disc. Therefore, its elastic modulus is 7.65 × 10 ^ 10, and its density is 7.5 × 10 ^ 3. And its poisson's ratio is 0.32. These are the things we must know and master.
2. For piezoelectric ceramics, if it is placed under DC voltage, they will there be electrostriction.
A piezoelectric ceramic transducer that has an inherent resonant frequency. Therefore, if you do not work at this point, then the sensitivity of the transducer will be reduced, and if it is serious, the measurement will be blocked, so that the transducer will not work properly.
This is because if the soft material piezoelectric ceramic is damp, it is prone to problems such as short circuit, which affects the normal use of the piezoelectric ceramic. And it should be noted that it is greatly affected by the environmental humidity. Therefore, the piezoelectric ceramics should be dampened so as not to affect its use.
Piezoelectric ceramics cancel each other out before they are polarized, and therefore, there is no piezoelectric effect or inverse piezoelectric effect. So, for one question, the answer is no. As for the resistance temperature of the piezoelectric ceramic, it is generally about half of the curie temperature. However, piezoelectric ceramics of different materials have different curie temperatures. Therefore, for question two, no specific value can be given.
For the storage of piezoelectric ceramics, in particular, it is not complicated and can be easily carried out. That is, a certain amount of piezoelectric ceramic is wrapped with a layer of wire, and then wrapped to form a cylinder, and then stored. However, it can also be stored separately in a small bag. Just avoid scratching and dropping the silver layer.
The specific difference between 1Mhz piezo ceramic and quartz crystals in deformation is that piezoelectric ceramics are volume-deformed to generate electric charges, and quartz crystals are in-area deformation. As for the question whether the zinc oxide resistor is a piezoelectric ceramic, its answer is no. Because the zinc oxide resistor is one of the ceramics, it is not a functional piezoelectric ceramic. Therefore, it does not belong to piezoelectric ceramics.
