A study of the EXAFS associated with the K absorption discontinuity of copper in CuGa and CuGe alloys

The extended X-ray absorption fine structure (EXAFS) associated with the K absorption discontinuity of copper has been studied in the pure metal and in some copper-gallium and copper-germanium alloys, using a bent crystal X-ray spectrograph. The results obtained are discussed in the light of the recent theory of EXAFS proposed by Lytle, Sayers and Stern. It has been shown for the first time that there exists in alloys a correlation between the EXAFS parameter α₁ and e/a ratio. This correlation has been used to obtain the value of the lattice parameter “a” for Cu-27 at.% Ge alloy, which is not available in literature.