Incommensurately Modulated δ″-Au1+xCd2-x Formed by an Unquenchable Phase Transformation from the γ-Brass δ'-Phase.
The synthesis and structural determination of the compound δ″-Au1+xCd2-x (0.07 ≤ x ≤0.08) is reported. The structure may be formally derived from that of ξ-CoZn13, but elemental ordering causes an incommensurate modulation as determined by single-crystal X-ray diffraction at room temperature. The compound δ″-Au3.23Cd5.76 crystallizes in the monoclinic super space group C2/m(0β(1)/2)00 with lattice