Short Range Order Diffuse Scattering from ζ Phase Ag–Al

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  • Short Range Order Diffuse Scattering fr

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Diffuse scattering due to short range order (SRO) of the hexagonal ζ phase, Ag–Al, has been studied by X-ray and electron diffraction methods. Intensity distribution was measured in the reciprocal space at room temperature. Peculiar distribution was found such as a thin plate and a hinge shape on h3=0 and 1 planes in the c* direction, respectively. The maxima on these planes are shifted from 1/3, 1/3, h3 and 2/3, 2/3, h3 positions. SRO parameters αlmn of a single crystal of Ag-34 at.%Al alloy have been determined by the Fourier transformation of X-ray diffuse intensity. It has been found from the electron diffraction patterns that the shift of the diffuse maxima from 1/3, 1/3, h3 decreases almost linearly with increasing Al concentration. The Fermi-surface-imaging theory seems to be appropriate to interpret the observations.

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