Three-dimensional mapping of diffuse scattering in Pb(Zn1/3Nb2/3)O3-xPbTiO3 -: art. no. 174109

High energy (67 keV) x-ray diffuse scattering measurements were performed on single crystals of Pb(Zn1/3Nb2/3)O-3-xPbTiO(3) (PZN-xPT), to map out the diffuse scattering distribution in all three dimensions around a large number of Bragg peaks simultaneously. For x = 0,4.5%, and 8%, the results are very similar, indicating same type of correlations of polarizations in these compounds. Our results show that the diffuse scattering intensity consists of six [110] rod-type intensities around reciprocal lattice points. A simple model is suggested where {110} type planar correlations of the in-plane [1 (1) over bar0] type polarizations in real space contribute to the [110] rod-type diffuse intensities in the reciprocal space. The planar correlations of polarizations are likely a result from condensations of soft [1 (1) over bar0] polarized optic phonon modes.