Abstract
Ionic-pair equal-time displacement correlations in relaxor lead magnesium niobate, PbMg 1/3 Nb 2/3 O 3 (PMN), were investigated at 300 and 270K in terms of an x-ray diffuse scattering technique. Functions of the distinct correlations were determined quantitatively. The results show the significantly strong rhombohedral-polar correlations regarding Pb-O, Mg/Nb-O, and O-O' pairs. Their spatial distribution at 300K forms an ellipse or a sphere with the diameters of 30-80A, and the sizes are reduced to 30-40A on cooling through local condensation of thermal lattice fluctuations. This direct observation of local structure in the system proves presence of the polar microregions in the paraelectric state which leads to the dielectric dispersion.
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