Piezoelectricity is the ability of certain materials to generate an electric charge in response to applied mechanical stress. This effect is reversible, as materials will mechanically deform when an electric field is applied. Common piezoelectric materials include quartz, silk, enamel, and barium titanate. When a mechanical force distorts the material, it causes the ions within the crystals to polarize. Releasing the force causes the flow of ions and generation of an electric current. Applications of piezoelectric materials include quartz watches, vibration sensors for train wheels, dance floors that convert kinetic energy to electricity, piezoelectric microphones, and medical ultrasound devices.

1. Piezoelectric Effect
By B SRI JYOTHSNA
15011D2003
JNTU, HYDERABAD
Soft Skills Lab - Presentation

2. Piezoelectricity ???

3. Ability to generate an electric charge in response to applied
mechanical stress.
‘Piezo’ derived from Greek word ‘piezein’ meaning “push”

6. Reversible
i.e,
converse of Piezoelectric effect

8. Mechanical force Electricity
Piezoelectric effect
Electricity Mechanical strain
Converse of Piezoelectric effect

9. Piezoelectric
Materials
Crystals which acquire a
charge when
compressed, twisted or
distorted and vice versa
Quartz
Silk
Enamel
Barium Titanate(BaTiO3)

10. Principle behind this effect ??

11. When a mechanical force
like a vibration is applied on
the material it polarizes.
when the force is released
flow of ions takes place and
electric current flows
through the crystal.

12. Applications

13. Converse of
Piezoelectric effect
is used in Quartz
watches

17. To detect wear in train wheels by detecting the
change in vibration behavior of the entire wheel by
generating mode shapes

18. Gyms, dance floors etc
can be laid with crystals
below the floor or tiles.
This energy can be used
to power the equipment in
the place.

20. Piezoelectric Microphone
- sound sensor
- sound waves bend the
crystal
- creates a changing
voltage.

21. Used in ultrasonic transducers
- medical ultrasound imaging
- Non Destructive Tests in
constructions

22. Piezoelectricity is a source
of “Green energy”
Flexible Piezo materials
withstand large
deformations
Conclusion

23. Thank You!