Journal Article

FZJ-2022-00572

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Phase Stability of Nanolaminated Epitaxial (Cr1–xFex)2AlC MAX Phase Thin Films on MgO(111) and Al2O3 (0001) for Use as Conductive Coatings

Pazniak, H. (Corresponding author)Extern* ; Marc Stevens, M. D.Extern* ; Zingsem, B.FZJ* ; Kibkalo, L.FZJ* ; Felek, M.Extern* ; Varnakov, S.Extern* ; Michael FarleExtern* ; Rosen, J.Extern* ; Wiedwald, U. (Corresponding author)Extern*

2021
ACS Publications Washington, DC

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Please use a persistent id in citations: http://hdl.handle.net/2128/30312  doi:10.1021/acsanm.1c03166

Abstract: In this study, we model the chemical stability in the (Cr1–xFex)2AlC MAX phase system using density functional theory, predicting its phase stability for 0 < x < 0.2. Following the calculations, we have successfully synthesized nanolaminated (Cr1–xFex)2AlC MAX phase thin films with target Fe contents of x = 0.1 and x = 0.2 by pulsed laser deposition using elemental targets on MgO(111) and Al2O3(0001) substrates at 600 °C. Structural investigations by X-ray diffraction and transmission electron microscopy reveal MAX phase epitaxial films on both substrates with a coexisting (Fe,Cr)5Al8 intermetallic secondary phase. Experiments suggest an actual maximum Fe solubility of 3.4 at %, corresponding to (Cr0.932Fe0.068)2AlC, which is the highest Fe doping level achieved so far in volume materials and thin films. Residual Fe is continuously distributed in the (Fe,Cr)5Al8 intermetallic secondary phase. The incorporation of Fe results in the slight reduction of the c lattice parameter, while the a lattice parameter remains unchanged. The nanolaminated (Cr0.932Fe0.068)2AlC thin films show a metallic behavior and can serve as promising candidates for highly conductive coatings.

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Contributing Institute(s):

1. Physik Nanoskaliger Systeme (ER-C-1)

Research Program(s):

1. 5351 - Platform for Correlative, In Situ and Operando Characterization (POF4-535) (POF4-535)
2. DFG project 405553726 - TRR 270: Hysterese-Design magnetischer Materialien für effiziente Energieumwandlung (405553726) (405553726)

Appears in the scientific report 2021

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Database coverage:
; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Essential Science Indicators ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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