Abstract
ABSTRACT During a study of decagonal quasicrystals and approximant crystals in the Al-Cr-Pd alloy system, a new crystalline phase has been found in an alloy with the composition Al (Cr, Pd) . The crystal structure has been determined by a 75 25 single-crystal X-ray analysis. This phase has an orthorhombic structure with lattice parameters a = 1.484 nm, b = 1.262 nm and c = 1.272 nm, and the space group is Pnma (No. 62). The atomic model was determined by the least-squares refinement to a final R value of 0.065 for 2418 unique reflections. The atomic arrangement of this phase is considered to be isostructural with Al Mn and 3 closely related to the structure of the O-phase (proposed by Sun, Yubuta and Hiraga in 1995) and Al-Pd-Mn decagonal quasicrystal. Structural relationships between the Al (Cr, Pd) phase, the O-phase, Al Mn 75 25 3 and the Al-Pd-Mn decagonal quasicrystal are discussed.
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