Diffuse neutron scattering in fl-PdD x (for x = 0.710, 0.742, 0.754 and 0.780) was observed around the 1 1 0X* ,~, j point in reciprocal space in the temperature range between 50 and 150 K. The detailed shape of the diffuse pattern is dependent on the deuterium concentration for x between 0.71 and 0.742 and nearly independent for higher concentrations. An increase of the diffuse intensities was found when cooling down the samples to 50 K and was associated with the anomaly of the resistivity. During an annealing treatment in PdD0.780 at 70 and 75 K, superlattice reflections appeared at tt47,7,2 ,,Jn~* and equivalent positions whose intensity after 53 h was 2% of the intensity of the 200 Bragg reflection of the sublattice.
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