Figure 5. Phase characterization of Mg2.3-yZn0.8CuySb2 (y = 0, 0.075, 0.100, and 0.125). (A) XRD patterns in the 2θ range of 20°-60°; (B) magnified XRD patterns from 20.00° to 28.68°; (C) evolution of lattice parameters a and c with increasing Cu content. XRD: X-ray diffraction.