Twelve-fold quasicrystal and its approximant of Ta62Te38 interpreted as modulated crystals
A transmission electron microscopy study reveals that the twelve-fold quasicrystal and its approximant in Ta62Te38 are crystals subjected to the structure modulation. It is composed of two modulated layers rotated by 30 degrees (or 90 degrees) to each other about their normal. Structures of the twelve-fold quasicrystal and its approximant can be related by modulation waves with the same directions but with slightly different wavelengths. The modulation is considered to be due to the rearrangement of atomic vacancies as a response to the occurrence of charge density waves.
Uchida
M
National Institute for Research in Inorganic Materials, Tsukuba, Ibaraki, Japan. uchidam@nirim.go.jp
Horiuchi
S