Campus Units

Ames Laboratory, Chemistry

Document Type

Conference Proceeding

Conference

2000 MRS Fall Meeting

Publication Version

Published Version

Publication Date

2001

Journal or Book Title

MRS Proceedings

Volume

643

First Page

1

Last Page

11

DOI

10.1557/PROC-643-K3.1

Conference Title

2000 MRS Fall Meeting

Conference Date

November 27-30, 2000

City

Boston, MA

Abstract

Problems concerning complete structural characterization of quasicrystals involve locating the atomic positions as well as determining the distribution of elements at each site. Quasicrystalline approximants provide models for potential building units of quasicrystals, but a clear determination of the elementaldecorations in such approximants also remains incomplete. We report experimental and theoretical studies of new, quaternary Bergman phases in the Li-Mg-Zn-Al system and a new, quasicrystalline approximant Li10Mg6Zn31Al3 (A16M34-type). A theoretical model using averaged Mulliken populations provides a means to track the segregation of elements (and vacancies) onto different sites as a function of valence electron concentration. As the Li content decreases, vacancies begin to occur at a specific site in the Bergman structure. The new approximant demonstrates how truncated tetrahedra can play an important role in forming clusters with possible fivefold symmetry in quasicrystalline structures.

Comments

This is a conference proceeding from MRS Proceedings 643 (2000): 1, doi:10.1557/PROC-643-K3.1. Posted with permission.

Copyright Owner

Materials Research Society

Language

en

File Format

application/pdf

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