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XRD spectra of carbon- (left panel) and nitrogen- (right panel) doped GeTe. The concentrations of the dopants are shown next to each set of spectra.
Fourier transformed EXAFS spectra of carbon- and nitrogen-doped GeTe measured at room temperature. The concentrations of the dopants are shown next to each set of spectra. The dashed line (guide for the eyes) marks the shorter Ge–Te bond. The peak located at originates predominantly from Ge–Ge bonds (Ref. 10).
Schematic presentation of the undoped (a) and doped (b) GeTe structures. The subset of the shorter bonds is shown by solid lines. In the undoped GeTe all Ge atoms are displaced coherently with the resulting shorter and longer interplane distances. Doping generates perturbation of the ordering with the resulting randomization of the distortions generating a structure with on an average equal interplane spacings.
Ge–Te bond-length and “static” MSRD at 10 K for undoped and C- and N-doped GeTe.
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