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The -brass Hume-Rothery [1] phases which adopt at vec values near about 21/13 presently attract most attention due to their structural complexity and challenge for the understanding of the underlying stabilization mechanism. Morton, by electron microscopy studies, revealed that the -brass regions of Cu-Zn [2], Ni-Zn [3] and Pd-Zn [4] do not only accommodate the -brass phase but also a bundle of structurally related, complex phases with lower symmetry than that of the -phase. A bundle of -brass related phases in the Zn-rich region of the Pd-Zn phase diagram is investigated using single crystal X-ray diffraction. In the course of a preliminary investigation of the Pd-Zn system, a -brass related composite structure (a = 1292.9(3) pm, b = 911.2(4) pm, c = 33.32(1) pm, Cmce, oC276), Pd24.3Zn75.7 has been refined from single crystal X-ray diffraction data in the conventional 3D space group using supercells [5]. It can be refined with the (3+1) dimensional space description as well by considering as commensurate modulated structure [6]. In order to gain an insight into expressions, cause and mechanism and structure-property relationship for such phases, we studied the impact of substitution of zero-valent palladium and bi-valent zinc by zero-valent platinum on the evolution of the structure of ternary derivatives of Pd24.3Zn75.7 by the use of (3+1) formalism. This presentation will discuss about the understanding of the complexity of the atomic arrangement through the various modulation which correlates with the variation of composition of the ternary phases.

Structural impact of Pt on a γ-brass related composite structure in the Zn–Pd system: a guided view by (3+1)-dimensional space description