Giant Piezoelectricity on k 31 Mode in Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 Single Crystals

The giant k 31 and piezoelectric d 31 constant in Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMNT) single-crystal plates with dimensions of 13 L ×4.0 W ×0.34 T /0.47 T mm were investigated via the poling field dependence of the ferroelectric properties and by impedance response analysis on the k 31 mode. Giant...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 2005-09, Vol.44 (9S), p.7028
Main Authors: Ogawa, Toshio, Matsushita, Mitsuyoshi, Iwasaki, Yosuke
Format: Article
Language:English
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Summary:The giant k 31 and piezoelectric d 31 constant in Pb(Mg 1/3 Nb 2/3 )O 3 -PbTiO 3 (PMNT) single-crystal plates with dimensions of 13 L ×4.0 W ×0.34 T /0.47 T mm were investigated via the poling field dependence of the ferroelectric properties and by impedance response analysis on the k 31 mode. Giant k 31 over 86% was realized for (110) PMNT single-crystal plates under the conditions of a poling temperature of 40°C (pseudo-cubic phase), DC poling fields over 200 V/mm, and a poling time of 10 min. P – E hysteresis loops in (110) PMNT plates with giant k 31 became asymmetric when the bipolar triangle pulse field exceeded 800 V/mm, which corresponds to the coercive field to obtain giant k 31 . The frequency response of impedance in (110) PMNT plates with giant k 31 consisted of a single vibration in the length direction. Furthermore, since there were two frequency constants, 680 Hz-m on k 31 (length direction) mode and 1425 Hz-m on k 32 (width direction) mode, a single domain structure in the (110) PMNT single-crystal plate was confirmed by an anisotropy of their frequency constants. A mechanism to realize giant k 31 can be explained by the relationship between the crystal plane and poling direction. The existence of a giant d 31 constant was proven by the strain measurement as well as by the impedance measurement.
ISSN:0021-4922
1347-4065
DOI:10.1143/JJAP.44.7028