Journal
MATERIALS LETTERS
Volume 58, Issue 14, Pages 2053-2056Publisher
ELSEVIER
DOI: 10.1016/j.matlet.2003.12.024
Keywords
ferroelectrics; piezoelectric materials; PMN-PT; critical composition; relaxor; piezoelectric constant; dielectric constant tunability
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Composition dependence of room temperature piezoelectric constant d(33) and dielectric constant tunability was investigated in the (001)-poled single crystals of (1-x)Pb(Mg1/3Nb2/3)O-3-xPbTiO(3) with x varying from 0.24 to 0.38. Temperature, frequency and composition dependence of the dielectric constant in the unpoled crystals shows that the critical composition for the relaxor state lies in the 0.69Pb(Mg-1/3 Nb-2/3)O-3-0.31PbTiO(3) crystal. It has also the largest piezoelectric constant d(33) of 2210 pC/N and highest dielectric constant tunability of 40.6% (at a dc bias of 1000 V/mm). The experiment results validate the prediction that the relaxor-based materials with the critical composition for the relaxer state will have the highest piezoelectric susceptibility. (C) 2004 Elsevier B.V. All rights reserved.
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