X-Ray K Absorption Edges of Alloys. III. Copper-Zinc and Nickel-Zinc Systems

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Abstract
A comparison of the fine structures at the K absorption edges of copper, nickel, and zinc in several alloys demonstrates that the rigid‐band model is strictly obeyed by copper‐zinc and nickel‐zinc solid solutions. The density of 3d holes in nickel declines progressively with increasing zinc concentration, vanishing at 30 at.% Zn according to a plot of the integrated absorptions in the corresponding energy region of the Ni K edge. A similar systematic decline in the 4s hole density at copper atoms takes place with increasing zinc content. A shift to lower energies of the initial rise in the Zn K edge in both alloy systems is ascribed to the emergence of 4s holes at zinc atoms. Although the initial rise of the copper K edge does not shift with alloying, the rest of the absorption spectrum shifts to lower energies with increasing zinc content. No shifts in the fine structure at the nickel K edge are observed.