The Ag solute content in the Cu matrix was determined from the
lattice parameter measured by XRD. The relative experimental
error of the lattice parameter for the alloy was only about
3 104. However, the deviation of the alloy lattice constant from
the value characteristic for pure Cu was about three orders of
magnitude smaller than the lattice parameter itself. Therefore, the
relative error of the solute Ag content was as large as 10–30%.
According to Ref. [26], the lattice constant dependence on Ag concentration
in Cu can be described by a second-order polynomial.
However, for dilute alloys (at least up to 10% Ag concentration) this