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Intergrowth Compounds in the Zn-Rich Zn−Pd System:  Toward 1D Quasicrystal Approximants
Chemistry of Materials
  • Olivier Gourdon, Iowa State University
  • Gordon J. Miller, Iowa State University
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A series of γ-brass related structures in the Zn-rich portion of the Zn−Pd phase diagram (ca. 80 at % Zn) is investigated using single-crystal diffraction and tight-binding electronic-structure calculations. Earlier research identified regular arrays of inversion antiphase domains (IAPDs) over a narrow composition range but did not report any characteristic superstructure(s) over the same range. Single-crystal X-ray diffraction allowed for the identification of lattice constants for six “phases” in Zn1-xPdx (0.15 < x < 0.25), and refinements of two crystal structures indicate two important potential building blocks for the intermediate compositions, one of these being the cubic γ-brass structure. A Farey tree construction is described that accounts for the observed long-period superlattice and provides a possible algorithm for targeting one-dimensional, quasiperiodic phases in this and related systems. Tight-binding electronic-structure calculations on the two limiting structures for this region of the Zn−Pd phase diagram suggest a relationship between structure and bonding in these complex intermetallic systems.

Reprinted (adapted) with permission from Chem. Mater., 2006, 18 (7), pp 1848–1856. Copyright 2006 American Chemical Society.

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American Chemical Society
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Olivier Gourdon and Gordon J. Miller. "Intergrowth Compounds in the Zn-Rich Zn−Pd System:  Toward 1D Quasicrystal Approximants" Chemistry of Materials Vol. 18 Iss. 7 (2006) p. 1848 - 1856
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