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Aging effect and large recoverable electrostrain in Mn-doped KNbO3-based ferroelectrics.
- Source :
-
Applied Physics Letters . 7/16/2007, Vol. 91 Issue 3, p032904. 3p. 1 Diagram, 4 Graphs. - Publication Year :
- 2007
-
Abstract
- KNbO3-based ferroelectrics have drawn much attention in recent years owing to their good piezoelectric performance among Pb-free piezoelectrics. However, little is known about the aging effect of these materials. In the present study, the authors systematically studied the aging effect of a Mn-doped (K0.99Li0.01)(Nb0.65Ta0.35)O3 ceramic with an aim to find an aging-induced recoverable electrostrain effect based on a reversible domain switching mechanism. They found that aging in the ferroelectric state made the otherwise normal hysteresis loop into a double loop, and more interestingly the aged sample demonstrated a large recoverable electrostrain of 0.125% at 4 kV/mm in an unpoled state. Such a behavior persisted up to 140 °C and showed good recoverability. The aging-induced double hysteresis and recoverable electrostrain suggest a reversible domain switching mechanism due to a symmetry-conforming short-range ordering of point defects. The striking similarity of the aging effect between acceptor-doped A+B5+O3 and acceptor-doped A2+B4+O3 systems indicates a common physical origin of aging. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 91
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 25960442
- Full Text :
- https://doi.org/10.1063/1.2756355