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The relaxor ferroelectric PbMg_1/3Ta_2/3O_3 was studied by single-crystalneutron and synchrotron x-ray diffraction and its detailed atomic structure hasbeen modeled in terms of static Pb-displacements that lead to the formation ofpolar nanoregions. Similar to the other members of the Pb-based relaxor familylike PbMg_1/3Nb_2/3O_3 or PbZn_1/3Nb_2/3O_3 the diffuse scattering in the[H,0,0]/[0,K,0] scattering plane has a butterfly-shape around the (h,0,0) Braggreflections and is transverse to the scattering vector for (h,h,0) peaks. Inthe [H,H,0]/[0,0,L] plane the diffuse scattering is elongated along the <1,1,2>directions and is transverse to the scattering vector for (h,h,h) reflections.We find that a model consisting of correlated Pb-displacements along the<1,1,1>-directions reproduces the main features of the diffuse scattering inPbMg_1/3Ta_2/3O_3 adequately when the correlation lengths between the Pb-iondisplacement vectors are longest along the <1,1,1> and <1,-1,0> and shortestalong <1,1,-2> directions.

Diffuse scattering from the lead-based relaxor ferroelectric PbMg_1/3Ta_2/3O_3