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Overpoling resistance of [011]-poled Pb(Mg1/3Nb2/3)O3PbTiO3 single crystals

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3 Author(s)
Shanthi, M. ; Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 112960 ; Chia, S.M. ; Lim, L.C.

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[011]-poled flux-grown Pb(Mg1/3Nb2/3)O3PbTiO3 (PMN–32%PT) single crystals are susceptible to overpoling at 0.4 kV/mm and higher fields, leading to degraded properties. This has been linked to the presence of an appreciable amount of the orthorhombic phase induced by the high poling fields. In contrast, flux-grown PMN–30%PT and PMN–31%PT single crystals show no signs of overpoling up to 2.0 kV/mm, both of which remain predominantly rhombohedral with a small amount of induced orthorhombic phase. Among the three compositions examined, flux-grown PMN–30%PT single crystal gives the best [011]-poled properties, with KT=5500–6000, d31=2100–2600 pC/N, and k31=0.90–0.94. The present work further shows that, for a given crystal composition, flux-grown PMN–PT single crystals exhibit superior overpoling resistance to their melt-grown counterparts.

Published in:

Applied Physics Letters  (Volume:87 ,  Issue: 20 )