Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection - Glossary - Part 4-2: Piezoelectric and dielectric materials - Piezoelectric ceramics

IEC/TS 61994-4-2:2011 specifies the terms and definitions for piezoelectric ceramics representing the present state-of-the-art, which are intended for use in the standards and documents of IEC technical committee 49. The main changes with respect to the previous edition are:
- definitions updated;
- terminology given in orderly sequence;
- drawing inserted for easier understanding the vibration modes.

Dispositifs piézoélectriques, diélectriques et électrostatiques et matériaux associés pour la commande, le choix et la détection de la fréquence - Glossaire - Partie 4-2: Matériau piézoélectriques et diélectriques - Céramiques piézoélectriques

La CEI/TS 61994-4-2:2011 spécifie les termes et définitions pour les matériaux en céramiques piézoélectriques présentant l'état actuel de la technique, destinés à être utilisés dans les normes et documents du comité d'études 49 de la CEI. Les modifications principales par rapport à l'édition antérieure sont:
- mise à jour des définitions;
- terminologie donnée selon un schéma bien ordonné;
- insertion de schémas pour une meilleure compréhension des modes de vibration.

General Information

Status
Published
Publication Date
07-Mar-2011
Current Stage
PPUB - Publication issued
Start Date
08-Mar-2011
Completion Date
08-Mar-2011
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IEC TS 61994-4-2:2011 - Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection - Glossary - Part 4-2: Piezoelectric and dielectric materials - Piezoelectric ceramics
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IEC/TS 61994-4-2
Edition 2.0 2011-03
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Piezoelectric, dielectric and electrostatic devices and associated materials for
frequency control, selection and detection – Glossary –
Part 4-2: Piezoelectric and dielectric materials – Piezoelectric ceramics
Dispositifs piézoélectriques, diélectriques et électrostatiques et matériaux

associés pour la commande, le choix et la détection de la fréquence – Glossaire –

Partie 4-2 : Matériaux piézoélectriques et diélectriques – Céramiques
piézoélectriques
IEC/TS 61994-4-2:2011
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
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---------------------- Page: 2 ----------------------
IEC/TS 61994-4-2
Edition 2.0 2011-03
TECHNICAL
SPECIFICATION
SPÉCIFICATION
TECHNIQUE
Piezoelectric, dielectric and electrostatic devices and associated materials for
frequency control, selection and detection – Glossary –
Part 4-2: Piezoelectric and dielectric materials – Piezoelectric ceramics
Dispositifs piézoélectriques, diélectriques et électrostatiques et matériaux

associés pour la commande, le choix et la détection de la fréquence – Glossaire –

Partie 4-2 : Matériaux piézoélectriques et diélectriques – Céramiques
piézoélectriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX H
ICS 01.040.31; 31.140 ISBN 978-2-88912-374-2
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – TS 61994-4-2 © IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PIEZOELECTRIC, DIELECTRIC AND ELECTROSTATIC DEVICES AND
ASSOCIATED MATERIALS FOR FREQUENCY CONTROL, SELECTION
AND DETECTION – GLOSSARY –
Part 4-2: Piezoelectric and dielectric materials –
Piezoelectric ceramics
FOREWORD

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Technical specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.
---------------------- Page: 4 ----------------------
TS 61994-4-2 © IEC:2011 – 3 –

IEC 61994-4-2, which is a technical specification, has been prepared by IEC technical

committee 49: Piezoelectric, dielectric and electrostatic devices and associated materials for

frequency control, selection and detection.

This second edition of IEC 61994-4-2 cancels and replaces the first edition published in 2003

This edition constitutes a technical revision.
The main changes with respect to the previous edition are :
– definitions updated;
– terminology given in orderly sequence;
– drawing inserted for easier understanding the vibration modes.
The text of this technical specification is based on the following documents:
Enquiry draft Report on voting
49/924/DTS 49/932/RVC

Full information on the voting for the approval of this technical specification can be found in

the report on voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

: Piezoelectric, dielectric and
A list of all parts of IEC 61994 under the general title

electrostatic devices and associated materials for frequency control, selection and detection –

Glossary can be found on the IEC website.

Future standards in this series will carry the new general title as cited above. Titles of existing

standards in this series will be updated at the time of the next edition.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• transformed into an International standard,
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
———————

The general title is changed from Piezoelectric and dielectric devices for frequency control and selection –

Glossary: to this title based on the change of the title of TC49 in 2009.
---------------------- Page: 5 ----------------------
– 4 – TS 61994-4-2 © IEC:2011
PIEZOELECTRIC, DIELECTRIC AND ELECTROSTATIC DEVICES AND
ASSOCIATED MATERIALS FOR FREQUENCY CONTROL, SELECTION
AND DETECTION – GLOSSARY –
Part 4-2: Piezoelectric and dielectric materials –
Piezoelectric ceramics
1 Scope

This part of IEC 61994 specifies the terms and definitions for piezoelectric ceramics

representing the present state-of-the-art, which are intended for use in the standards and

documents of IEC technical committee 49.
2 Normative references
Void
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
aging
irreversible changes with time in the properties of the material
3.2
bulk acoustic wave
elastic wave propagating in solid material such as piezoelectric ceramics
3.3
coupling coefficient

the coupling coefficient(electro-mechanical coupling coefficient) is a constant representing the

piezoelectric efficiency of a piezoelectric ceramic. More specifically, it represents the

efficiency of converting electrical energy into mechanical energy, and it is defined as the

square root of the ratio of mechanical energy exited to electrical energy transferred.

mechanical energy excited
electrical energy transferred
3.4
Curie temperature

temperature at which a ferroelectric material undergoes a structural phase transition to a state

where a spontaneous polarisation vanishes
3.5
electric polarisation

at a given point within a domain of quasi-infinitesimal volume V, vector quantity equal to the

of the substance contained within the domain divided by the volume,
electric dipole moment p
---------------------- Page: 6 ----------------------
TS 61994-4-2 © IEC:2011 – 5 –
P = p / V
NOTE The electric polarization P satisfies the relation
D=ε E+P
where
D is the electric flux density;
E is the electric field strength and
ε is the dielectric constant in free space.
[IEC 60050-121: 1998, 121-11-37]
3.6
expansion vibration

vibration mode of a disc or plate where the displacement is in the plane surface (see Figure 1)

3.7
ferroelectric material

material that exhibits, over some range of temperature, a spontaneous electric polarization

that can be reversed or reoriented by application of an electric field
3.8
flexural vibration

for a resonator shaped as a thin narrow bar, displacements appearing in a direction

perpendicular to the length of the bar (see Figure 1)
3.9
frequency constant

product of the resonance frequency and the vibrating piece dimension which determines the

resonance frequency.

NOTE For fundamental mode the frequency constant equals to the velocity of an acoustic wave.

3.10
insulation resistance

resistance under specified conditions between two conductive elements separated by

insulating materials
[IEC 60050-151: 2001,151-15-43]
3.11
length vibration

for a resonator shaped as a thin and narrow bar, the dominant deformation which appears

only along the longitudinal axis (see Figure 1)
3.12
(absolute) permittivity
in a medium is
scalar or tensor quantity the product of which by the electric field strength E
equal to the electric flux density D :
D=ε×E

NOTE For an isotropic medium the permittivity is a scalar quantity; for an anisotropic medium it is a tensor

quantity.
[IEC 60050-121: 1998, 121-12-12]
---------------------- Page: 7 -------------
...

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