Lupascu, Doru C. and Nuffer, Jürgen and Rödel, Jürgen (1999):
Acoustic emission from different PZT.
In: Ferroelectrics, pp. 249-255, 222, (1-4), ISSN 0015-0193, [Online-Edition: http://dx.doi.org/10.1080/00150199908014823],
[Article]
Abstract
Acoustic emissions (AE) in ferroelectrics originate from three major sources: domain pattern changes, electric discharges and microcracking. All three may play a significant roll as damage mechanisms for the long term reliability of these materials in actuator applications. Contributions of at least two mechanisms in commercial PZT's are presented and the feasibility of a unique assignment of emission signature to mechanism is discussed. Soft PZT's show a distinct threshold for the first appearance of AE during poling. Large strain changes in these materials due to ldquoeasyrdquo domain wall motion do not yield AE while high strain levels generate cascaded events. Subsequent polarization reversals generate AE events at lower fields. Hard PZT's continuously generate AE during the whole hysteretic cycle with no observable field levels of ldquoeasyrdquo deformation, Domain wall motion is contrasted to the energy release of elastically prestressed domain states, domain nucleation, discharges and microcracking
| Item Type: | Article |
|---|---|
| Erschienen: | 1999 |
| Creators: | Lupascu, Doru C. and Nuffer, Jürgen and Rödel, Jürgen |
| Title: | Acoustic emission from different PZT |
| Language: | English |
| Abstract: | Acoustic emissions (AE) in ferroelectrics originate from three major sources: domain pattern changes, electric discharges and microcracking. All three may play a significant roll as damage mechanisms for the long term reliability of these materials in actuator applications. Contributions of at least two mechanisms in commercial PZT's are presented and the feasibility of a unique assignment of emission signature to mechanism is discussed. Soft PZT's show a distinct threshold for the first appearance of AE during poling. Large strain changes in these materials due to ldquoeasyrdquo domain wall motion do not yield AE while high strain levels generate cascaded events. Subsequent polarization reversals generate AE events at lower fields. Hard PZT's continuously generate AE during the whole hysteretic cycle with no observable field levels of ldquoeasyrdquo deformation, Domain wall motion is contrasted to the energy release of elastically prestressed domain states, domain nucleation, discharges and microcracking |
| Journal or Publication Title: | Ferroelectrics |
| Volume: | 222 |
| Number: | 1-4 |
| Divisions: | 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials 11 Department of Materials and Earth Sciences > Fachbereich Materialwissenschaft (1999 aufgegangen in 11 Fachbereich Material- und Geowissenschaften) 11 Department of Materials and Earth Sciences > Material Science 11 Department of Materials and Earth Sciences |
| Date Deposited: | 19 Nov 2008 16:24 |
| Official URL: | http://dx.doi.org/10.1080/00150199908014823 |
| Identification Number: | doi:10.1080/00150199908014823 |
| License: | [undefiniert] |
| Export: |
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