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DS: Fachverband Dünne Schichten

DS 8: Thin Film Properties II

DS 8.7: Talk

Wednesday, March 20, 2024, 11:15–11:30, A 060

Defect break-down in systematically disordered Cr2AlC — •Joao S. Cabaco1, 6, Maciej O. Liedke2, Javier Pablo-Navarro3, 4, Fabian Ganss1, Cesar Magen3, Manuel R. Ibarra3, 4, Ulrich Kentsch1, Maik Butterling2, Andreas Wagner2, Jurgen Lindner1, Jurgen Faßbender1, 5, Christoph Leyens6, Richard Boucher6, and Rantej Bali11Institute of Ion Beam Physics and Materials Research, HZDR, Germany — 2Institute of Radiation Physics, HZDR, Germany — 3Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Spain — 4Laboratory of Advanced Microscopies, University of Zaragoza, Spain — 5Institute of Solid State and Materials Physics, TU Dresden, Germany — 6Institute of Materials Science, TU Dresden, Germany

The presence of open-volume defects, such as vacancies, can influence the structural, magnetic, and transport properties. This study uses ion irradiation to investigate the evolution of defects in MAX-phase Cr2AlC. Thin-films of 50 nm and 500 nm were irradiated at increasing fluences, using both inert ions and transition metal ions. Through the combined use of positron annihilation and ab-initio simulations, it was possible to distinguish different types of defects, determine their size and concentration. Large clusters of 9-15 vacancies, originally present in the as-grown films, transform into Al mono-vacancies and Cr-Al di-vacancies upon ion irradiation. Furthermore, an overall reduction in open-volume defect concentration and size due to irradiation was observed. Grant: (DFG) TRANSMAX no. 456078299.

Keywords: MAX phases; Vacancies; Di-vacancies; Positron Annihilation; Doppler broadening

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