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

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
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 01.040.31 - Electronics (Vocabularies)
• ICS: 31.140 - Piezoelectric devices
• Technical Committee: TC 49 - Piezoelectric, dielectric and electrostatic devices and associated materials for frequency control, selection and detection
• Drafting Committee: WG 11 - TC 49/WG 11
• Current Stage: PPUB - Publication issued
• Start Date: 30-Apr-2011
• Completion Date: 08-Mar-2011

Relations

• Revises: IEC TS 61994-4-2:2003 - Piezoelectric and dielectric devices for frequency control and selection - Glossary - Part 4-2: Piezoelectric and dielectric materials - Piezoelectric ceramics
• Effective Date: 05-Sep-2023

Standards Content (Sample)

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
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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
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX H
ICS 01.040.31; 31.140 ISBN 978-2-88912-374-2

– 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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• the subject is still under technical development or where, for any other reason, there is the
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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.

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.

– 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
k=
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
P
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
V
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 equa
...