2010.03.19 9307PIEVOL04E

●All specifications in this catalog and production status of products are subject to change without notice. Prior to the purchase, please contact NEC TOKIN for updated product data.

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4 Piezoelectric Ceramics Vol.04

Evaluatio

NEC TO

transducer m

1)

Resonan

When an

frequency f i

natural frequ

violently. T

frequency fr

A constan

was used for

resonance fr

can be measu

such as the H

Resonanc

equivalent ci

anti-resonan

following eq

Fig

fr

=

{

12

/

π

fa

=

{

12

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π

A piezoelectric material responds mechanically when

voltage is applied, and conversely, generates a voltage in

response to a mechanical change.

To create piezoelectric ceramics, polycrystalline

ceramics are fired and baked at a high temperature. Then

electrodes are mounted and a DC field applied in order to

polarize the ceramic material; once polarized, the

material exhibits piezoelectric properties, allowing it to

be used as a piezoelectric ceramic transducer. These

transducers are also called electrostriction transducers,

since ceramic crystals are deformed by electricity.

Barium titanate and lead zircotitanate are the most

popular piezoelectric ceramics. In addition, NEC TOKIN

also uses a variety of other materials, including

conventional lead zircotitanate.

This results in piezoelectric materials that can be used

in a wide variety of applications: those that use the

piezoelectric effect (such as igniters and pickups), those

that utilize resonance (e.g., filters), and those that utilize

the electrostrictive effect (such as piezoelectric buzzers

and displacement elements).

In addition to barium titanate and lead zircotitanate,

popular as piezoelectric ceramics, NEC TOKIN offers multi-

component solid ceramics developed from conventional

lead zircotitanate ceramics. They meet a wide range of

specifications for a wide range of applications. The main

applications include: those that use the piezoelectric

effect (such as sensors and pickups), those that utilize

resonance (such as transducers for ultrasonic motors and

cleaning equipments), and those that utilize the

electrostrictive effect (such as piezoelectric sound

elements and displacement elements). In addition, they

can be used as ultrasonic vibrators and transducers.

Design Materials

Outline