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  • Feuerbacher, MichaelJülich Research Centre (author)

The Samson phase, β-Mg2Al3, revisited

  • Article/chapterEnglish2007

Publisher, publication year, extent ...

  • 2009-09-25
  • Walter de Gruyter GmbH,2007
  • 30 s.

Numbers

  • LIBRIS-ID:oai:lup.lub.lu.se:cf365bca-6566-4406-8b94-1a6ab97e2e4b
  • https://lup.lub.lu.se/record/cf365bca-6566-4406-8b94-1a6ab97e2e4bURI
  • https://doi.org/10.1524/zkri.2007.222.6.259DOI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:for swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • The Al-Mg phase diagram has been reinvestigated in the vicinity of the stability range of the Samson phase, β-Mg2Al3 (cF1168). For the composition Mg38.5Al61.5, this cubic phase, space group Fd3̄m (no 227), a = 28.242(1) Å, V = 22526(2) Å3, undergoes at 214°C a first-order phase transition to rhombohedral β′-Mg2Al3, (hR293), a = 19.968(1) Å, c = 48.9114(8) Å, V = 16889(2) Å3, (i.e. 22519 Å3 for the equivalent cubic unit cell) space group R3m (no 160), a subgroup of index four of Fd3̄m. The structure of the β-phase has been redetermined at ambient temperature as well as in situ at 400°C. It essentially agrees with Samson's model, even in most of the many partially occupied and split positions. The structure of β′-Mg 2Al3 is closely related to that of the β-phase. Its atomic sites can be derived from those of the β-phase by group-theoretical considerations. The main difference between the two structures is that all atomic sites are fully occupied in case of the β′-phase. The reciprocal space, Bragg as well as diffuse scattering, has been explored as function of temperature and the β- to β′-phase transition was studied in detail. The microstructures of both phases have been analyzed by electron microscopy and X-ray topography showing them highly defective. Finally, the thermal expansion coefficients and elastic parameters have been determined. Their values are somewhere in between those of Al and Mg.

Subject headings and genre

  • CMA
  • Elastic parameters
  • Electron microscopy
  • Magnesium aluminides
  • Microstructure
  • Powder diffraction structure analysis
  • Samson phase
  • X-ray diffraction

Added entries (persons, corporate bodies, meetings, titles ...)

  • Thomas, CarstenJülich Research Centre (author)
  • Makongo, Julien P.A.Max Planck Institute for Chemical Physics of Solids (author)
  • Hoffmann, StefanMax Planck Institute for Chemical Physics of Solids (author)
  • Carrillo-Cabrera, WilderMax Planck Institute for Chemical Physics of Solids (author)
  • Cardoso, RaulMax Planck Institute for Chemical Physics of Solids (author)
  • Grin, YuriMax Planck Institute for Chemical Physics of Solids (author)
  • Kreiner, GuidoMax Planck Institute for Chemical Physics of Solids (author)
  • Joubert, Jean MarcVersailles Saint-Quentin-en-Yvelines University (author)
  • Schenk, ThomasEcole des Mines de Nantes (author)
  • Gastaldi, JosephAix-Marseille University (author)
  • Nguyen-Thi, HenriAix-Marseille University (author)
  • Mangelinck-Nöel, NathalieAix-Marseille University (author)
  • Billia, BernardAix-Marseille University (author)
  • Donnadieu, PatriciaInstitut National Polytechnique De Grenoble (ENSEEG - INP Grenoble) (author)
  • Czyrska-Filemonowicz, AleksandraAGH University of Science and Technology (author)
  • Zielinska-Lipiec, AnnaAGH University of Science and Technology (author)
  • Dubiel, BeataAGH University of Science and Technology (author)
  • Weber, ThomasETH Zürich(Swepub:lu)ekol-twe (author)
  • Schaub, PhilippeETH Zürich (author)
  • Krauss, GünterETH Zürich (author)
  • Gramlich, VolkerETH Zürich (author)
  • Christensen, JeppeStockholm University,Lund University,Lunds universitet,-lup-obsolete,Forskargrupper vid Lunds universitet,Inorganic Chemistry Group, Ebbe Nordlander-lup-obsolete,Lund University Research Groups(Swepub:lu)maxl-jch (author)
  • Lidin, SvenStockholm University(Swepub:lu)poly-sln (author)
  • Fredrickson, DanielStockholm University (author)
  • Mihalkovic, MarekInstitute of Physics, Slovak Academy of Sciences (author)
  • Sikora, WieslawaAGH University of Science and Technology (author)
  • Malinowski, JanuszAGH University of Science and Technology (author)
  • Brühne, StefanGoethe University (author)
  • Proffen, ThomasLos Alamos National Laboratory (author)
  • Assmus, WolfAGH University of Science and Technology (author)
  • De Boissieu, MarcInstitut National Polytechnique De Grenoble (ENSEEG - INP Grenoble) (author)
  • Bley, FrancoiseInstitut National Polytechnique De Grenoble (ENSEEG - INP Grenoble) (author)
  • Chemin, Jean LouisInstitut National Polytechnique De Grenoble (ENSEEG - INP Grenoble) (author)
  • Schreuer, JürgenGoethe University (author)
  • Steurer, WalterETH Zürich (author)
  • Jülich Research CentreMax Planck Institute for Chemical Physics of Solids (creator_code:org_t)

Related titles

  • In:Zeitschrift fur Kristallographie: Walter de Gruyter GmbH222:6, s. 259-2880044-2968

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