Atomic Displacements in Metallic Solid Solutions

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Abstract
Local atomic displacements in copper-base solid solutions have been determined from measurements of the integrated intensities of Bragg diffraction of x rays by powder samples. The rms amplitudes of ``static'' displacements due to different effective atomic sizes of solute and solvent in solution were determined (but with low precision) to be given by (〈US2〉av)½=K[xB(1−xB)]½ (da/dxB)0, where xB is the atomic fraction solute, (da/dxB)0 is the limiting change of lattice parameter with solute concentration as xB→0, and K is a constant ∼0.3. The difficulty of distinguishing ``size'' effects of purely elastic origin from any atomic displacements due to valence electron screening is discussed. Debye temperatures of the alloys were determined and the value of the Debye temperature for copper was found to agree with the calorimetric value.

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