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The Samson phase, β...
The Samson phase, β-Mg2Al3, revisited
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- Feuerbacher, Michael (författare)
- Jülich Research Centre
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- Thomas, Carsten (författare)
- Jülich Research Centre
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- Makongo, Julien P.A. (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Hoffmann, Stefan (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Carrillo-Cabrera, Wilder (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Cardoso, Raul (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Grin, Yuri (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Kreiner, Guido (författare)
- Max Planck Institute for Chemical Physics of Solids
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- Joubert, Jean Marc (författare)
- Versailles Saint-Quentin-en-Yvelines University
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- Schenk, Thomas (författare)
- Ecole des Mines de Nantes
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- Gastaldi, Joseph (författare)
- Aix-Marseille University
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- Nguyen-Thi, Henri (författare)
- Aix-Marseille University
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- Mangelinck-Nöel, Nathalie (författare)
- Aix-Marseille University
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- Billia, Bernard (författare)
- Aix-Marseille University
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- Donnadieu, Patricia (författare)
- Institut National Polytechnique De Grenoble (ENSEEG - INP Grenoble)
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- Czyrska-Filemonowicz, Aleksandra (författare)
- AGH University of Science and Technology
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- Zielinska-Lipiec, Anna (författare)
- AGH University of Science and Technology
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- Dubiel, Beata (författare)
- AGH University of Science and Technology
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- Weber, Thomas (författare)
- ETH Zürich
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- Schaub, Philippe (författare)
- ETH Zürich
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- Krauss, Günter (författare)
- ETH Zürich
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- Gramlich, Volker (författare)
- ETH Zürich
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- Christensen, Jeppe (författare)
- Stockholm University,Lund University,Lunds universitet,-lup-obsolete,Forskargrupper vid Lunds universitet,Inorganic Chemistry Group, Ebbe Nordlander-lup-obsolete,Lund University Research Groups
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- Lidin, Sven (författare)
- Stockholm University
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- Fredrickson, Daniel (författare)
- Stockholm University
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- Mihalkovic, Marek (författare)
- Institute of Physics, Slovak Academy of Sciences
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- Sikora, Wieslawa (författare)
- AGH University of Science and Technology
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- Malinowski, Janusz (författare)
- AGH University of Science and Technology
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- Brühne, Stefan (författare)
- Goethe University
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- Proffen, Thomas (författare)
- Los Alamos National Laboratory
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- Assmus, Wolf (författare)
- AGH University of Science and Technology
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- De Boissieu, Marc (författare)
- Institut National Polytechnique De Grenoble (ENSEEG - INP Grenoble)
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- Bley, Francoise (författare)
- Institut National Polytechnique De Grenoble (ENSEEG - INP Grenoble)
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- Chemin, Jean Louis (författare)
- Institut National Polytechnique De Grenoble (ENSEEG - INP Grenoble)
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- Schreuer, Jürgen (författare)
- Goethe University
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- Steurer, Walter (författare)
- ETH Zürich
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(creator_code:org_t)
- 2009-09-25
- 2007
- Engelska 30 s.
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Ingår i: Zeitschrift fur Kristallographie. - : Walter de Gruyter GmbH. - 0044-2968. ; 222:6, s. 259-288
- Relaterad länk:
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http://dx.doi.org/10... (free)
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https://lup.lub.lu.s...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- CMA
- Elastic parameters
- Electron microscopy
- Magnesium aluminides
- Microstructure
- Powder diffraction structure analysis
- Samson phase
- X-ray diffraction
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Feuerbacher, Mic ...
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Thomas, Carsten
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Makongo, Julien ...
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Hoffmann, Stefan
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Carrillo-Cabrera ...
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Cardoso, Raul
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Grin, Yuri
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Kreiner, Guido
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Joubert, Jean Ma ...
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Schenk, Thomas
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Gastaldi, Joseph
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Nguyen-Thi, Henr ...
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Mangelinck-Nöel, ...
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Billia, Bernard
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Donnadieu, Patri ...
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Czyrska-Filemono ...
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Zielinska-Lipiec ...
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Dubiel, Beata
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Weber, Thomas
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Schaub, Philippe
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Krauss, Günter
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Gramlich, Volker
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Christensen, Jep ...
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Lidin, Sven
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Fredrickson, Dan ...
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Mihalkovic, Mare ...
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Sikora, Wieslawa
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Malinowski, Janu ...
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Brühne, Stefan
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Proffen, Thomas
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Assmus, Wolf
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De Boissieu, Mar ...
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Bley, Francoise
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Chemin, Jean Lou ...
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Schreuer, Jürgen
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Steurer, Walter
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