Electron Diffraction Study of the Space Group Variation in the Al–Mn–Pt T-Phase

Binary high temperature “Al3Mn” (T-phase) and its extensions in ternary systems were the subjects of numerous crystallographic investigations. The results were ambiguous regarding the existence or lack of the center of symmetry: both Pna21 and Pnam space groups were reported. Our research on the Al–...

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Bibliographic Details
Published inSymmetry (Basel) Vol. 14; no. 1; p. 38
Main Authors Tamari, Rimon, Grushko, Benjamin, Meshi, Louisa
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2022
Subjects
Alloys
Aluminum
Annealing
Crystallography
Electron diffraction
High temperature
Homogeneity
Manganese
Metallurgy
Symmetry
Ternary systems
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ISSN2073-8994
2073-8994
DOI10.3390/sym14010038

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Summary:Binary high temperature “Al3Mn” (T-phase) and its extensions in ternary systems were the subjects of numerous crystallographic investigations. The results were ambiguous regarding the existence or lack of the center of symmetry: both Pna21 and Pnam space groups were reported. Our research on the Al–Mn–Pt T-phase allowed concluding that inside a continuous homogeneity region, the structure of the Al-rich T-phase (e.g., Al78Mn17.5Pt4.5) belongs to the non-centrosymmetric Pna21 space group, while the structure of the Al-poor T-phase (such as Al71.3Mn25.1Pt3.6) is centrosymmetric, i.e., Pnam. Following metallurgical and crystallographic considerations, the change in the symmetry was explained.
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ISSN:2073-8994
2073-8994
DOI:10.3390/sym14010038