Campus Units

Chemistry, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

2010

Journal or Book Title

Inorganic Chemistry

Volume

49

Issue

10

First Page

4570

Last Page

4577

DOI

10.1021/ic100118q

Abstract

Exploratory syntheses in the M−Au−Ge (M = Ca, Yb) systems have led to the discovery of two cleanly separated non-stoichiometric phases M3Au∼14.4Ge∼4.6 (I) and M3.25Au∼12.7Ge∼5.3 (II). Single crystal X-ray studies reveal that both (space group Im3̅) feature body-centered-cubic packing of five-shell multiply endohedral clusters that resemble those in the parent YCd6 (= Y3Cd18) and are akin to approximate phases in other quasicrystal systems. However, differences resulting from various disorders in these are distinctive. The innermost cluster in the M3Au∼14.4Ge∼4.6 phase (I) remains a disordered tetrahedron, as in the YCd6 parent. In contrast, its counterpart in the electron-richer M3.25Au∼12.7Ge∼5.3 phase (II) is a “rattling” M atom. The structural differentiations between I and II exhibit strong correlations between lattice parameters, cluster sizes, particular site occupancies, and valence electron counts.

Comments

This is an article from Inorganic Chemistry 49 (2010): 4570, doi: 10.1021/ic100118q. Posted with permission.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

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