Issue |
EPL
Volume 97, Number 5, March 2012
|
|
---|---|---|
Article Number | 57004 | |
Number of page(s) | 5 | |
Section | Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties | |
DOI | https://doi.org/10.1209/0295-5075/97/57004 | |
Published online | 24 February 2012 |
Characteristic temperatures and field effect in KTa1−x NbxO3 relaxor crystals seen via acoustic emission
1
Department of Applied Physics, The Hebrew University of Jerusalem - Jerusalem 91904, Israel
2
Graduate School of Pure and Applied Sciences, University of Tsukuba - Tsukuba, Ibaraki 305-8573, Japan
Received:
10
January
2012
Accepted:
3
February
2012
[100]-oriented KTa1−xNbxO3 (x=0.32) relaxor ferroelectric crystals have been studied by acoustic emission (AE) count rate in the temperature range from 200 K to 700 K. Burns temperature Td=620 K () and intermediate temperature T*=310 K () as well as both the tetragonal-cubic TT-C=259 K () and orthorhombic-tetragonal TO-T=243 K () phase transition temperatures have been clearly detected. T* is found to be influenced by an external DC electric field E: T* essentially decreases with a slope of approximately − 60 K·cm/kV accompanied with weakening in , as E enhances. The mechanisms of abnormal T*(E) and (T) dependences are discussed.
PACS: 77.80.Jk – Relaxor ferroelectrics / 77.80.B- – Phase transitions and Curie point / 43.40.Le – Techniques for nondestructive evaluation and monitoring, acoustic emission
© EPLA, 2012
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