Abstract
We report the cryogenic dielectric and piezoelectric activities in [0 0 1]-, [1 1 0]- and [1 1 1]-oriented rhombohedral (1 - x)Pb(Mg1/3Nb2/3)O3-xPbTiO3single crystals for temperatures down to -200 °C. Unusual dielectric relaxation resulting from collective pinning of randomly distributed point defects to ferroelectric macrodomain walls is observed instead of a phase transition in all the poled crystals below -150 °C rather than in the unpoled ones. Stiffening of the poled crystals by the cryogenic temperature-induced pinning effect leads to a characteristic decrease in the piezoelectric coefficient (d31) and the compliance coefficient ( ), along with a similar quantitative increase in frequency constant (N31). An almost temperature-independent property region is revealed in a wide temperature range of -50 to -150 °C, enabling applications of the crystals in cryogenic fields.
Original language | English |
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Article number | 182001 |
Journal | Journal of Physics D: Applied Physics |
Volume | 42 |
Issue number | 18 |
DOIs | |
Publication status | Published - 17 Sept 2009 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films