Evidence for Microcrystallites in Icosahedral Almnsi

E. A. Stern, Y. Ma

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

An analysis of extended X-ray absorption fine structure (EXAFS) measurements at the Mn K-edge of the α-crystalline and icosahedral (i) phases of MnAlSi indicates that the icosahedral cage of Mn atoms that is part of the common structural unit in both phases retains its cubic distortion in the i-phase. Neither a quasicrystalline nor a randomly connected icosahedron (icosahedral glass) model is in agreement with this experimental result. A model that is consistent with the new EXAFS results and other properties of the i-phase of MnAlSi is one in which ~ 40Å crystallites of the α- phase are oriented icosahedrally along the threefold directions of the structural unit.

Original languageEnglish
Pages (from-to)103-108
Number of pages6
JournalPhilosophical Magazine Letters
Volume56
Issue number3
DOIs
StatePublished - Sep 1987
Externally publishedYes

Bibliographical note

Funding Information:
This research was supported partially by the U.S. Department of Energy under Contract DEA505-80-ER 10742.

Funding

This research was supported partially by the U.S. Department of Energy under Contract DEA505-80-ER 10742.

FundersFunder number
U.S. Department of EnergyDEA505-80-ER 10742

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