Campus Units

Chemistry, Ames Laboratory

Document Type

Article

Publication Version

Published Version

Publication Date

2006

Journal or Book Title

Journal of the American Chemical Society

Volume

128

Issue

40

First Page

13268

Last Page

13273

DOI

10.1021/ja063897u

Abstract

Single-crystal structures are reported for Sc3Mg0.18(1)Zn17.73(3), the 1/1 approximant crystal (AC), and Sc11.18(9)Mg2.5(1)Zn73.6(2), the 2/1 AC, in the corresponding icosahedral quasicrystal (i-QC) system. The 1/1 AC crystallizes in space group Im3̄, a = 13.863(2) Å, Z = 8, and the 2/1 AC, in Pa3̄, a = 22.412 (2) Å, Z = 8. The latter, which is valuable in pointing the way to the QC structure, is the best ordered and refined 2/1 example to date. The fundamental building blocks in both ACs are triacontahedral clusters centered by smaller multiply endohedral Tsai-type arrays; the former are condensed through body-centered-cubic packing in the 1/1 and primitive cubic packing in the 2/1 AC. Novel prolate rhombohedra centered by Sc−Sc dimers are also generated between triacontahedra in the 2/1 AC.

Comments

This is an article from the Journal of the American Chemical Society 128 (2006): 13268, doi: 10.1021/ja063897u. Posted with permission.

Copyright Owner

American Chemical Society

Language

en

File Format

application/pdf

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