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

Rimon Tamari; Benjamin Grushko; Louisa Meshi

doi:10.3390/sym14010038

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

Rimon Tamari, Benjamin Grushko, Louisa Meshi

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Abstract

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., Al₇₈Mn_17.5Pt_4.5 ) belongs to the non-centrosymmetric Pna2₁ space group, while the structure of the Al-poor T-phase (such as Al_71.3Mn_25.1Pt_3.6 ) is centrosymmetric, i.e., Pnam. Following metallurgical and crystallographic considerations, the change in the symmetry was explained.

Original language	English
Article number	38
Journal	Symmetry
Volume	14
Issue number	1
DOIs	https://doi.org/10.3390/sym14010038
State	Published - Jan 2022
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.

Keywords

AlMn
Aluminide
Center of symmetry
Convergent Beam Electron Diffraction (CBED)
Space group

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10.3390/sym14010038

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abstract = "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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author = "Rimon Tamari and Benjamin Grushko and Louisa Meshi",

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N2 - 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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KW - Center of symmetry

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KW - Space group

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

Abstract

Bibliographical note

Keywords

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