Electron diffraction and electron microscope study on decagonal quasicrystals on AlNiFe alloys
1993; Elsevier BV; Volume: 153-154; Linguagem: Inglês
10.1016/0022-3093(93)90322-o
ISSN1873-4812
AutoresMichiyoshi Tanaka, Kenji Tsuda, Masami Terauchi, Akira Fujiwara, A.‐P. Tsai, Akihisa Inoue, T. Masumoto,
Tópico(s)X-ray Diffraction in Crystallography
ResumoDecagonal quasicrystals of Al70Ni10+xFe20−x(0 ≤ x ≤ 10) were investigated by convergent-beam electron diffraction (CBED) and transmission electron microscopy (TEM). It was revealed by the CBED method that the alloys with 0 ≤ x ≤ 7 belong to the space group of the noncentrosymmetric P10m2 and those with 7 < x ≤ 10 to the centrosymmetric P10/mmm. High resolution electron microscope images detected the existence of a specific pentagonal atom cluster in all the alloys investigated. Dark-field microscopy disclosed that the change in space group at x ≈ 7.5 takes place upon the sudden decrease of the domain size or the rapid mixing of the atom clusters with the positive and negative polarities.
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