Fig. 1. (a) XRD patterns recorded at room temperature of the CoSb₃ doped Te thin films (T1, T2, T3, and T4) and the simulated CoSb₃ pattern. The (*) attest to the presence of free-Sb reflexion and (#) to the low-intensity peak (015) and (110) of the Sb₂Te₃ nanoparticles, and (b) evolution of the lattice parameter a and the highlight of the (310) reflexion shift (inset) with the Te target power (the red line is just a guide to the eye).