The structures of hexagonal phases in Mg-Zn-RE (RE = Sm and Gd) alloys

K. Sugiyama, K. Yasuda, T. Ohsuna, K. Hiraga

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36 Citations (Scopus)


The structures of hexagonal μ-MgZnRE phases of Mg28.3Zn65.2Sm6.5 and Mg28.6Zn63.8Gd7.7, were determined by single crystal X-ray structural analysis: μ-MgZnSm, P63/mmc (No. 194), a = 14.619(1) Å, c = 8.708(1) Å, atoms/cell = 92, F(000) = 2484, μ = 27.44 mm-1, Dcalc = 5.621 Mg m-3, R = 0.0201 for the observed 1110 reflections with Fobs > 4.0σ(Fobs) and μ-MgZnGd, P63/mmc (No. 194), a = 14.633(2) Å, c = 8.761(2) Å, atoms/cell = 92, F(000) = 2527, μ = 28.51 mm-1, Dcalc = 5.707 Mg m-3, R = 0.0210 for the observed 1084 reflections with F0bS > 4.0σ(FObS). The structure of μ-MgZnRE is closely related to that of the MgZn2 Laves phase (P63/mmc, a = 5.223 Å, c = 8.566 Å). The introduction of large RE elements increases the distortion of the icosahedral atomic arrangement around Zn and this produces a variety of icosahedral linkages in the μ-MgZnRE structure.

Original languageEnglish
Pages (from-to)537-543
Number of pages7
JournalZeitschrift fur Kristallographie - New Crystal Structures
Issue number10
Publication statusPublished - 1998 Jan 1


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