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Two-dimensional quasicrystal with eightfold rotational symmetry

1987; American Physical Society; Volume: 59; Issue: 9 Linguagem: Inglês

10.1103/physrevlett.59.1010

1092-0145

Ning Wang, Hongsong Chen, K. H. Kuo,

Mineralogy and Gemology Studies

A 2D quasicrystal with an eightfold rotational axis has been found in rapidly solidified V-Ni-Si and Cr-Ni-Si alloys by means of transmission electron microscopy. The electron diffraction pattern taken along this axis shows no periodicity but a clear eightfold orientation symmetry. The corresponding high-resolution electron microscopic image agrees well with the 2D eightfold quasilattice consisting of squares and 45\ifmmode^\circ\else\textdegree\fi{} rhombi.