and fitted curves for (a) edge EXAFS data and (b) edge EXAFS data for different samples studied in this work. The experimental data points are shown by symbols and the fitted data by straight lines (c) the contributions of the various paths for the edge and edge data for sample with (d) the contributions of the various paths for the edge and edge data for sample with .
NN distance Zn–Se (filled squares) and Be–Se (filled circles) as a function of x evaluated from the EXAFS signal. The corresponding distances evaluated from the model of Ref. 9 are added for comparison (open symbols).The stars show the average NN distance as determined from the XRD data VCA. The straight lines are guide to eye.
Pseudo Debye–Waller factor for the Zn–Se and Be–Se bonds as a function of x. A comparison of the plots obtained at the edge data for samples with and is shown in the inset.
Different configurations of the NNs around of Se atoms in ZnBeSe mixed crystals. The filled and open circles refer to the Zn and Be atoms, respectively, the Se atoms being at the quasicenter of the cube. The distorted bonds inside each tetrahedral unit are schematically shown (plain lines) and the undistorted bonds (dotted lines) inside each tetrahedral unit are shown for reference purpose.
NNN distance evaluated from the Se and edge EXAFS data as a function of x. The straight lines are guide to eye.
Se–Be–Se and Se–Zn–Se bond angles as a function of x, evaluated from the nearest and NNN distances. The Zn–Se–Zn bond angle is also shown in the figure. The straight lines are guide to eye.
NNN configuration after placing two tetrahedra next to each other. (a) Se–Be–Se bond angle same as the nominal value of 109.5°, (b) increase in the Se–Be–Se bond angle, and (c) decrease in the Se–Be–Se bond angle. The filled and the open circles refer to the Zn and Be atoms, respectively.
The values for the NNN scattering paths as a function of x.
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