Some experimental investigations of electromechanical properties of (PbZn1/3Nb2/3O3)0.92-(PbTiO3)0.08 relaxor single crystals

The present paper deals with some electromechanical properties of the relaxor-type ferroelectric (PbZn1/3Nb2/3O3)0.92-(PbTiO3)0.08 single crystal. The cube samples with faces oriented in the [100], direction, and the plates with major plane oriented in the [100]. direction were measured. Using the low-field dynamic (resonant) and high-field static methods we have measured the set of material characteristics: piezoelectric coefficients d(33), electromechanical coupling coefficient k(31), and elastic coefficients s(lambdamu)(E). In addition, the piezoelectric coefficient d(31) was studied in more detail; in particular, its temperature dependence was determined in the range 200-330 K. Data on displacement vs. electric field dependence in this temperature range have been obtained using a new double beam interferometer and optical helium cryostat. The main problem of such measurements, namely the suppression of cooling system vibrations as a necessary condition for the measurements, was solved by a new method. (C) 2002 Elsevier Science B.V. All rights reserved.