Piezoelectricity

1. Md. Merajul Islam
ID:555131021
2nd batch,
7th semester
Dept. of EEE
Course : Properties of
materials
Piezoelectricity
1

2. 2
The piezoelectric effect
was discovered in 1880
by two French physicists,
brothers Pierre and Paul-
Jacques Curie
History:

3. 3
An electrical potential
of a crystal when it
subjected to mechanical
stress
How you define piezoelectricity?

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Piezoelectric Materials
Belemnite (structurally identical to
quartz), cane sugar, quartz, Rochelle
salt, topaz, tourmaline, and bone
Barium titan-ate and lead zircon-ate
titan-ate.

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How piezoelectricity works
• the charges in a piezoelectric
crystal are exactly balanced
without symmetrically arranged.
• If the crystal squeezed by force
the charges out of balance
• Charges no longer cancel one
another out and net positive and
negative charges appear on
opposite crystal faces.

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Direct and Inverse Piezoelectric Effect
• Mechanical energy into electrical energy
• Electrical energy into mechanical energy.

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Electro mechanics
Polarized piezoelectric materials are characterized by
several coefficients and relationships.
D Electric flux density
T Mechanical stress
E Electrical field
S Mechanical strain
d Piezoelectric charge coefficient
εT Permittivity (for T = constant)
sE
Compliance or elasticity
coefficient (for E = constant)

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Applications
• High Voltage and Power Sources
• Sensors
• Piezoelectric Motors

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http://www.explainthatstuff.com/piezoelectricity.html
http://www.piceramic.com/piezo-technology/fundamentals.html
1. KASAP; Principles of Electronic Materials and Devices; 3rd
edition
2.
3.
References

10. Thanks