Dielectric or Piezoelectric: What's the Difference?

[Gunmo]

Hi,

What is the difference between dielectric material and piezoelectric material ?
Even Wikipedia use exactly the same figure for illustration.

I googled,

Both of them is
- material between plates
- polarization, dipole of molecule

As far as I understood from google, When material is pressed between plate
- dielectric material do not create voltage if there is no external voltage.
- piezoelectric material create voltage without external voltage.

Am I correct ?

 

[nasu]

A piezoelectric material is dielectric usually. Not all dielectric materials are piezoelectric.

 

[Tom.G]

As far as I understood from google, When material is pressed between plate
- dielectric material do not create voltage if there is no external voltage.
- piezoelectric material create voltage without external voltage.

Am I correct ?

Yes!

 

[Chandra Prayaga]

A piezoelectric material generates a voltage when pressure is applied, and the material is strained (deformed). The reverse can also happen: if a voltage is applied across a piezoelectric material, it deforms. quartz is a very important example of a piezoelectric material.

 

[nasu]

A piezoelectric material is dielectric usually. Not all dielectric materials are piezoelectric.

However a piezoelectric does not stop being a dielectric as well. The two proprties are not mutually exclusive.

 

[Chandra Prayaga]

However a piezoelectric does not stop being a dielectric as well. The two proprties are not mutually exclusive.

I agree. In fact the piezoelectric property is the dependence of the dielectric polarization on stress.