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14 October 2003 Dielectric and piezoelectric properties of Pb(Zn1/3Nb2/3)O3-PbTiO3 single crystals
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Proceedings Volume 5062, Smart Materials, Structures, and Systems; (2003)
Event: Smart Materials, Structures, and Systems, 2002, Bangalore, India
Single crystals of the relaxor ferroelectric solid solution family Pb(Zn1/3Nb2/3)O3-PbTiO3 (PZN-PT) have been shown to produce very high levels of electric field induced strains with large electromechanical coupling coefficients when poled aong the <001> direction. These materials also exhibit a high dielectric permittivity and they are therefore very promising materials for transducer and actuator applications. We have carried out a systematic investigation of the dielectric and piezoelectric properties of different compositions, using specimens manufactured by TRS Ceramics Inc. Both the dielectric and piezoelectric strain responses of these crystals have been studied as a function of temperature and applied electric field. The applied field and temperature dependences of the rhombohedral to tetragonal and the tetragonal to cubic phase transitions have been determined. Our results suggest that a DC bias field can be used to stabilize the tetragonal phase. The strain measurements have been used to determine the d33 values in both phases as a function of temperature. The PZN-PT crystals have their polar direction along the <111> axis but not much has been reported on the piezoelectric properties of crystals poled in this direction. We have used laser Doppler interferometry to measure the piezoelectric strains as a function of DC bias field applied in the <111> direction in PZN-PT crystals and we have determined values of the piezoelectric coefficients as a function of the DC bias field. High d15 values over 3000 pC/N have been observed along <111> direction.
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Wei Ren, Shi-Fang Liu, and Benoy K. Mukherjee "Dielectric and piezoelectric properties of Pb(Zn1/3Nb2/3)O3-PbTiO3 single crystals", Proc. SPIE 5062, Smart Materials, Structures, and Systems, (14 October 2003);

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