Thank you!Stephen Hodgson said:I don't know how much you know about the crystal structure of piezoelectric crystals, but if you do, think about what happens to the unit cell:
If we consider a ZnS blende fcc Crystal unit cell with the Zn ion in the centre, as the crystal undergoes a stress, 2 of the Sulpher ions (making up the tetrahedron closer to the Zn ion and 2 get further away resulting in a shift in the equilibrium position of the Zn ion. This results in an Electric dipole.
The reverse piezoelectric effect is the movement of the Sulpher ions due to the electric field. i.e. the inverse of the paragraph above.
As for questions 2 and 3, think:
Does an finite stress result in an infinite electric field if held for a long time?
Does a constant stress result in a constant, or changing potential across the crystal?
This is the Cambridge materials page on piezoelectrics. DoITPoMS is great for all materials science in general.
http://www.doitpoms.ac.uk/tlplib/piezoelectrics/dipole.php
Hope this helps!
The inverse piezoelectric effect is a phenomenon in which an applied electric field causes a change in the shape or dimensions of a material. This effect is the opposite of the direct piezoelectric effect, in which mechanical stress leads to an electric charge.
The inverse piezoelectric effect occurs due to the rearrangement of charged particles within a material in response to an applied electric field. This rearrangement causes a change in the material's shape or dimensions, and the magnitude of the effect depends on the material's piezoelectric coefficient.
The inverse piezoelectric effect has numerous practical applications, such as in sensors, actuators, and transducers. It is also used in devices such as inkjet printers, speakers, and ultrasound machines.
The magnitude of the inverse piezoelectric effect can be measured by applying an electric field to a material and measuring the resulting change in shape or dimensions. This can be done using specialized equipment such as piezoelectric force sensors or strain gauges.
Some common materials that exhibit the inverse piezoelectric effect include quartz, ceramics, and certain types of crystals. These materials are often used in electronic devices and sensors due to their strong piezoelectric properties.