Convergent-beam electron diffraction and electron microscope studies of decagonal quasicrystals

M. Tanaka, K. Tsuda, K. Saitoh

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Decagonal quasicrystals have been investigated by convergent-beam electron diffraction (CBED) and transmission electron microscopy. The CBED method has revealed that there exist two quasicrystals which belong to the space groups of noncentrosymmetric P10m2 and centrosymmetric P105/mmc. The dark-field microscopy has revealed the existence of inversion domains with an antiphase shift of c/2 at the domain boundaries in the alloys with the space group P10m2. High-resolution electron microscopy has revealed the existence of specific pentagonal atom clusters in all the alloys except Al-Ni-Rh and Al-Ni-Ir alloys. The screw axes in the quasicrystals with the space group of P105/mmc exist at the centers of the clusters in Al-Ni-Rh and Al-Ni-Ir alloys, but exist between the neighbouring two pentagonal atom clusters in the other alloys. A phase transformation from P10m2 to P105/mmc occurs through the mixing of atom clusters with the positive and negative polarities.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalScience Reports of the Rerearch Institutes Tohoku University Series A-Physics
Issue number1
Publication statusPublished - 1996 Mar


  • Convergent-Beam Electron Diffraction
  • Decagonal Phase
  • High-Resolution Electron Microscope Image
  • Quasicrystal
  • Transmission Electron Microscopy


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