Modifying vacancy defects during systematic disordering of the Cr2AlC nano-lamellar system
Cabaço, João S. ; Liedke, Maciej Oskar ; Pablo-Navarro, Javier ; Ganss, Fabian ; Magén, César ; Ibarra García, Manuel (Universidad de Zaragoza) ; Kentsch, Ulrich ; Butterling, Maik ; Wagner, Andreas ; Lindner, Jürgen ; Faßbender, Jürgen ; Leyens, Christoph ; Boucher, Richard ; Bali, Rantej
Resumen: The layered structure of MAX phases is associated with a number of functional properties and is the subject of extensive research. While the unit-cell layers of these structures have been well studied, much less is known about the distribution and manipulation of point defects within them. Here, we selected the prototype Cr2AlC system and, using variable energy positron beams, observed Doppler broadening and positron annihilation lifetimes to track the evolution of defects caused by the penetration of energetic transition metal ions (Co+ and Mn+) and noble gas ions (Ar+ and Ne+). In all cases an overall reduction of the open-volume defect concentration is observed post-irradiation. Atomic displacements induced by the penetrating ions drastically modify the defect distribution: the concentration of agglomerates of 9–15 vacancies (corresponding to positron lifetimes of 335–450 ps) in the precursor [Cr2C/Al]n layers is suppressed, whereas Al mono- and Al-Cr di-vacancy (lifetimes 217–231 ps) concentrations are enhanced. This breakdown of large defects into point defects scales with atomic displacements and is largely independent of the penetrating ion species, providing insights into the manipulation of point defects in nano-layered systems.
Idioma: Inglés
DOI: 10.1016/j.apsusc.2024.161180
Año: 2025
Publicado en: Applied Surface Science 679 (2025), 161180 [10 pp.]
ISSN: 0169-4332
Financiación: info:eu-repo/grantAgreement/ES/DGA/E13-23R
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER E28-23R
Financiación: info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes.
Exportado de SIDERAL (2024-09-26-10:58:28)
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Idioma: Inglés
DOI: 10.1016/j.apsusc.2024.161180
Año: 2025
Publicado en: Applied Surface Science 679 (2025), 161180 [10 pp.]
ISSN: 0169-4332
Financiación: info:eu-repo/grantAgreement/ES/DGA/E13-23R
Financiación: info:eu-repo/grantAgreement/ES/DGA-FEDER E28-23R
Financiación: info:eu-repo/grantAgreement/EC/H2020/823717/EU/Enabling Science and Technology through European Electron Microscopy/ESTEEM3
Tipo y forma: Article (Published version)
Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)
You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use. You may not use the material for commercial purposes. Exportado de SIDERAL (2024-09-26-10:58:28)
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Record created 2024-09-26, last modified 2024-09-26