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- W948484952 abstract "Mn+1AXn phases are thermodynamically stable nanolaminated ternary carbides and nitrides showing both metallic and ceramic properties. The letter M stands for an early transition metal, the letter A represents an A-element from group IIIA - VIA, and X is carbon and/or nitrogen. The M-atoms form octahedra with X-atoms in their centers. The index n describes the thickness of the Mn+1AXn-layer which is embedded between two hexagonal A-layers. The exceptional properties of these materials have their origin in the microstructure. In order to gain insight on the atomic level, the method of perturbed γ-γ angular correlation (PAC) is applied. The radioactive probes 111In/111Cd and 181Hf/181Ta are inserted into the host materials by ion implantation and/or neutron activation to measure the electric field gradient (EFG) acting on the site of the probe nuclei. The first topic of the work is the search for optimal annealing parameters, so that a high a fraction of probes senses the same local environment. The next step is the determination of the lattice site of the probes in the MAX structure. As a result, it is found that 111In occupies in the In- and Al-based MAX phases the A-site, whereas 181Hf occupies in Hf2InC the M-site. As a surprising result this study demonstrates that the PAC method is sensitive to different stacking sequences in phases with the same constituents but different stoichiometric ratios. The experiments are compared to extensive calculations based on the density functional theory (DFT) which are presented for nearly all members of the family of MAX-compounds for the first time. The DFT calculations reproduce the measured EFGs with high accuracy and support the hypothesis that the probes reside on the predicted lattice sites." @default.
- W948484952 created "2016-06-24" @default.
- W948484952 creator A5058468122 @default.
- W948484952 date "2014-05-19" @default.
- W948484952 modified "2023-09-27" @default.
- W948484952 title "Untersuchung der elektrischen Hyperfeinwechselwirkung in M n+1 AX n -Phasen mittels der gestörten γ-γ-Winkelkorrelation" @default.
- W948484952 hasPublicationYear "2014" @default.
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