Figure 1

Comparison between the experimental HRTEM image of a CoPt cluster and simulated images with various values of the chemical order parameter $S$.Reuse & Permissions

Figure 2

a) Schematic view of the structure used for HRTEM simulations: the truncated octahedral CoPt cluster (here, with a perfect L$1_0$ order) lies on an amorphous carbon film. b) Montage showing the FFT of the experimental HRTEM image (left side) and of a simulated one, with $S=1$ (right side). The peaks used for the determination of $R$ are indicated. c) Peak profiles determined from the FFT of a simulated HRTEM image (here with $S=1$): the ratio $R=I_{001}/I_{200}$ is calculated from the integrated intensities. d) Theoretical $R(S)$ curve computed for various degrees of chemical order. The experimental value $R_{\exp }$ is indicated and provides an interval of $S$ values (hatched area) which are compatible with the HRTEM observations. The shaded areas correspond to the uncertainties.Reuse & Permissions