X-ray photoelectron diffraction study of the approximant Al5Co2(001) quasicrystal

The intermetallic Al5Co2 is defined as a structurally complex material and is considered a low-order quasicrystalline approximant. A single crystal of Al5Co2(001) was obtained by the Czochralski method. The sample was characterized by X-ray photoelectron spectroscopy (XPS), low-energy electron diffr...

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Bibliographic Details
Published in:Physical chemistry chemical physics : PCCP 2023-01, Vol.25 (4), p.3387-3394
Main Authors: Lhonidas de Senna Junior, Pancotti, Alexandre, Alex Sandre Kilian, Abner de Siervo, Diehl, Renee D, Marie-Cécile de Weerd, Ledieu, Julian, Gaudry, Emilie, Fournée, Vincent, Abreu, Guilherme Jean P
Format: Article
Language:English
Subjects:
Beams (radiation)
Chemical Sciences
Crystal structure
Czochralski method
Inorganic chemistry
Low energy electron diffraction
or physical chemistry
Photoelectrons
Reliability aspects
Single crystals
Surface layers
Theoretical and
X ray photoelectron spectroscopy
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Summary:The intermetallic Al5Co2 is defined as a structurally complex material and is considered a low-order quasicrystalline approximant. A single crystal of Al5Co2(001) was obtained by the Czochralski method. The sample was characterized by X-ray photoelectron spectroscopy (XPS), low-energy electron diffraction (LEED), and X-ray photoelectron diffraction (PED). The surface composition was also analyzed by XPS, indicating only Al and Co compounds. In the current research, the crystal structure was qualitatively analyzed using the LEED patterns for different incident beam energies indicating a (1 × 1) termination, also in accordance with some literature works. The structure study was performed by applying the standard software MSCD and showed a (1 × 1) pattern. In addition, four different termination models for this termination were tested. The reliability factor indicated that the best termination belongs to the Al-rich surface layer.
ISSN:1463-9076
1463-9084
DOI:10.1039/d2cp04891d