Figure 1
Cd1−xBexTe structural, optical and mechanical properties. (a) CPMG Cd0.93Be0.07Te 125Te NMR signal. The binomial distribution of Te-centered nearest-neighbor (NN) tetrahedon clusters depending on the number of Cd atoms at the vertices in case of a random Cd \(\leftrightarrow\) Be substitution is added for comparison (inset). The NMR peaks are labeled accordingly. (b) Composition dependence of the main Cd1−xBexTe electronic transitions measured at room temperature by transmission (filled symbols, Fig. S5a) and ellipsometry (hollow symbols, Fig. S5b). CdTe (Ref.37) and BeTe (Ref.20) values taken from the literature are added, for reference purpose. Linear (dashed) trends between parent values are guidelines for the eye. Laser lines used to excite the Raman spectra are positioned to appreciate resonance conditions. Antagonist arrows help to appreciate the shift of electronic transitions by lowering temperature from ambient to liquid nitrogen, by referring to the \({E}_{0}\) gap of CdTe Ref.38. (c) Pressure dependence of the zincblende (zb), rocksalt (rs) and Cmcm (cm) Cd0.89Be0.11Te lattice constant(s) measured by high-pressure X-ray diffraction (Fig. S1c). (d) The \({B}_{0}\) value derived for Cd0.89Be0.11Te in its native zb phase (filled circle) from the corresponding volume vs. pressure dependence (Fig. S1d) is compared with the parent values taken from the literature (filled triangles, Refs.39,40) and with current ab initio data obtained with the AIMPRO (hollow diamonds) and SIESTA (hollow squares) codes. Corresponding linear \(x\)-dependencies are shown (dashed lines), for reference purpose.
