A comparison of linear and volume analysis for the local-order parameters in two binary body-centred cubic alloys

A procedure is presented for the separation of the local-order intensity scattered by a binary body-centred cubic alloy along three lines in reciprocal space. Linear Fourier coefficients are defined for the distribution of the local-order intensity along these lines and these are related to the Warren local-order coefficients, α_i. The local-order coefficients have been obtained by this so-called linear analysis for Fe-3.9 at.% Mo and Fe-6.1 at.% Mo, and are compared with local-order coefficients derived by Fourier analysis of the local-order intensity in its minimum repeat volume.