The T-Al3 (Mn, Pd) quasicrystalline approximant: Chemical order and phason defects

The structure of an orthorhombic phase called T-Al 3 Mn, Pd, with the composition Al 72· Pd 3·2 Mn 24·5 , has been determined by single-crystal X-ray diffraction. The space group is Pnma and the magnitudes of the cell parameters are a = 14.717 A, b = 12.510 Å and c = 12.594 A. The final reliability...

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Veröffentlicht in:Philosophical magazine letters 1997-04, Vol.75 (4), p.197-208
Hauptverfasser: Klein, H., Boudard, M., Audier, M., DE BOISSIEU, M., Vincent, H., Beraha, L., Duneau, M.
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container_end_page 208
container_issue 4
container_start_page 197
container_title Philosophical magazine letters
container_volume 75
creator Klein, H.
Boudard, M.
Audier, M.
DE BOISSIEU, M.
Vincent, H.
Beraha, L.
Duneau, M.
description The structure of an orthorhombic phase called T-Al 3 Mn, Pd, with the composition Al 72· Pd 3·2 Mn 24·5 , has been determined by single-crystal X-ray diffraction. The space group is Pnma and the magnitudes of the cell parameters are a = 14.717 A, b = 12.510 Å and c = 12.594 A. The final reliability factor is R = 0.022 and for 2734 independent reflections. The structure exhibits a strong chemical ordering and is compared to the isomorphic phase T-Al 3 Mn and to the closely related R-Al 60 Mn 11 Ni 4 phase. The possibility of a phase transformation occurring through the motion of phason defects, between the T-Al 3 (Mn, Pd) orthorhombic phase and another orthorhombic phase, isomorphic to the R-Al 60 Mn 11 Ni 4 phase, is briefly discussed.
doi_str_mv 10.1080/095008397179624
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source Periodicals Index Online; Taylor & Francis Journals Complete
subjects Alloys
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Quasicrystals
Semi-periodic solids
Structure of solids and liquids
crystallography
Structure of specific crystalline solids
title The T-Al3 (Mn, Pd) quasicrystalline approximant: Chemical order and phason defects
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