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Representative XRD patterns of Bi2−xSbxTe3 NWs of different nominal compositions; (a) for x = 0 i.e., pure Bi2Te3 (b) for x = 2 i.e., Sb2Te3 (c) Bi-rich and (d) Sb-rich Bi2−xSbxTe3 NWs. The NWs show a noticeable peak broadening with increasing Sb, due to the grain size difference between the Bi-rich and Sb-rich compositions, showing polycrystalline signature for all of the types of NWS.
