Composition, temperature, and crystal orientation dependence of the linearelectro-optic properties of Pb(Zn1/3Nb2/3)O-3-PbTiO3 single crystals

The linear electro-optic (EO) coefficients of Pb(Zn1/3Nb2/3)O-3-PbTiO3 sing le crystals over a broad composition range were investigated at temperature s from -20 to 80 degrees C. The orientation effect on the EO coefficients w as also examined. For crystals poled in the < 001 > direction, a large r(33 ) was observed near the morphotropic phase boundary (MPB). More importantly , r(33) was found to be independent of temperature for the crystals on the tetragonal side of the MPB. In contrast, r(13) was nearly zero for all comp ositions examined at all the temperatures. The large r(33) near the MPB and the observed crystal orientation effect of the EO coefficients were also a nalyzed. (C) 2000 American Institute of Physics. [S0003-6951(00)02735-2].