Crystal structure of a 2/1 cubic approximant in an Al-Rh-Si alloy

K. Sugiyama, W. Sun, K. Hiraga

Research output: Contribution to journalConference articlepeer-review

8 Citations (Scopus)


The structure of a cubic Al66.5Rh26.1Si 7.3 phase, which is referred as a 2/1 approximant for an icosahedral phase, was determined by means of single crystal X-ray structural analysis: space group Pm3, a = 19.935(2) Å, Mo Kα (λ = 0.71069 Å); refined as Al70.4Rh29.6, R(wR2) = 0.087(0.194) for 1391 reflections with I > 2.0σ(I). A dodecahedral atom cluster is located at the origin of a unit cell, and the corresponding atomic arrangement can be described as nine shells with a local icosahedral symmetry, by suggesting a close similarity to the dodecahedral atomic cluster of the 2/1-AlPdMnSi approximant. The 2/1-AlRhSi approximant is a second example of a simple cubic arrangement of dodecahedral atom clusters that are 20 Å in diameter.

Original languageEnglish
Pages (from-to)156-160
Number of pages5
JournalJournal of Non-Crystalline Solids
Publication statusPublished - 2004 Mar 15
Event8th International Conference on Quasicrystals - Bangalore, India
Duration: 2002 Sept 82002 Sept 13


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