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Presentation
Where are the Atoms in Quasicrystals? Experimental and Theoretical Studies of Ternary and Quaternary Approximants
MRS Proceedings
  • Gordon J. Miller, Iowa State University
  • Chi-Shen Lee, Iowa State University
  • Wen-Jiuan Tsai, Iowa State University
Document Type
Conference Proceeding
Conference
2000 MRS Fall Meeting
Publication Version
Published Version
Publication Date
1-1-2001
DOI
10.1557/PROC-643-K3.1
Conference Title
2000 MRS Fall Meeting
Conference Date
November 27-30, 2000
Geolocation
(42.3600825, -71.05888010000001)
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
Citation Information
Gordon J. Miller, Chi-Shen Lee and Wen-Jiuan Tsai. "Where are the Atoms in Quasicrystals? Experimental and Theoretical Studies of Ternary and Quaternary Approximants" Boston, MAMRS Proceedings Vol. 643 (2001) p. 1 - 11
Available at: http://works.bepress.com/gordon-miller/118/