Conlon, K. H.; Luo, Hongjie; Viehland, Dwight D.; Li, Jiefang; Whan, T.; Fox, J. H.; Stock, Chris; Shirane, Gen (American Physical Society, 2004-11-19)
Spatially resolved neutron diffraction as a function of crystal depth in Pb(Mg1/3Nb2/3)O-3 reveals the presence of a distinct near-surface region where a strong distortion in the lattice exists. A dramatic change in both the lattice constant and the Bragg peak intensity as a function of crystal depth is observed to occur in this region over a length scale similar to100 mum. This confirms a previous assertion, based on a comparison between high-energy x rays and neutrons, that such a near surface region exists in the relaxors. Consequences to both single crystal and powder diffraction measurements and previous bulk neutron diffraction measurements on large single crystals are discussed.