Materials Transactions Online

Materials Transactions, JIM, Vol.31 No.7 (1990) pp.567-572
© 1990 The Japan Institute of Metals

High-Resolution Electron Microscopy and Atomic Arrangements of Al-Mn-Si and Al-Li-Cu Icosahedral Quasicrystals

Kenji Hiraga* and Daisuke Shindo*

Two types of icosahedral quasicrystals of Al-Mn-Si and Al-Li-Cu were examined with a 400 kV high-resolution electron microscope having a resolution of 0.17 nm. Their images taken with the incident beam parallel to the fivefold symmetry axis clearly show a structure model formed by the aggregation of atom clusters with icosahedral symmetry. The observed image contrast of Al-Mn-Si was reproduced by an image calculation of the structure model using the multislice method. The calculation demonstrated that high-resolution images taken with the 400 kV electron microscope faithfully represent projected potential of the quasicrystals.

(Received February 13, 1990)

Keywords: high-resolution electron microscopy, icosahedral quasicrystal, quasicrystal, aluminum-manganese-silicon, aluminum-lithium-copper

* Institute for Materials Research, Tohoku University, Katahira, Aoba, Sendai 980, Japan.

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© 1990 The Japan Institute of Metals