Daniel Jürgens's research while affiliated with Georg-August-Universität Göttingen and other places
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Publications (5)
The method of perturbed angular correlation (PAC) was applied to selected MAX phases with 211 stoichiometry. Radioactive 111In ions were implanted in order to measure the electric field gradients (EFG) in the key compounds Ti2InC and Zr2InC to determine the strength and symmetry of the EFG at the In-site. Further PAC studies in the In-free MAX phas...
PAC measurements were done for the first time on the 211-MAX phases Ti2AlN and Cr2GeC which do not have indium as a constituent material. Radioactive 111In+ ions were implanted at 400 keV into the MAX bulk-samples. The radiation damage was annealed under vacuum up to temperatures of 1373 K. During each heating cycle the samples were sealed in new q...
PAC measurements were done for the first time on the 211-MAX phases Ti 2 AlN and Cr 2 GeC which do not have indium as a constituent material. Radioactive 111 In + ions were implanted at 400 keV into the MAX bulk-samples. The radiation damage was annealed under vacuum up to temperatures of 1373 K. During each heating cycle the samples were sealed in...
Stainless steel films were reactively magnetron sputtered in argon/nitrogen gas flow onto oxidized silicon wafers using austenitic AISI 316 stainless-steel targets. The deposited films of about 300 nm thickness were characterized by conversion electron Mö-i;ssbauer spectroscopy, magneto-optical Kerr-effect, X-ray diffraction, Rutherford backscatter...
MAX-phases are hexagonal ternary carbides and nitrides with the general formula: M
n + 1
AX
n
and n = 1 to 3. 111In was implanted into the two MAX compounds Ti2InC and Zr2InC. Based on the general knowledge of previous 111In implantations one expects to find the probes on the indium lattice-site in these compounds. First experiments on the anneal...
Citations
... As the sintering temperature increases, Ti 2 InC becomes the major phase and the intensity of C peaks versus that of Ti 2 InC decrease such significantly that only the major peak of C can be identified. temperature is higher than 1250°C [8,20]. In fact, the decomposition of MAX phase into TiC and A is also reported in other MAX phases, such as Ti 3 AlC 2 and Ti 3 SiC 2 [21]. ...
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... the HFD (0-3 T) curve (Fig. 7(d)) was related to sites from the region with a nitrogen concentration below 16%. The HFD (3-45) distribution profile (Fig. 7(d)) is very similar to that observed by Cusenza et al. [36], which was associated with a martensitic structure, but unlike ours, their isomer shift was close to zero. However, a significant presence of structures other than EA is eliminated by the analysis of the diffractogram (Fig. 2), similarly to how it was discussed for the 6 Torrsample CXMS. ...
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... Previous work on MAX phases, using PAC with an 111 In-111 Cd probe, revealed the existence of A site specific, strong, and axially symmetric EFGs in In, Al, Ge, and As containing 211-MAX phases [22][23][24]. Based on those results, it is now possible to investigate the deformation of polycrystalline MAX phases by an experiment, in which PAC spectra, measured under uniaxial load and after removing the load, are compared. ...
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... Jeitschko et al. [13] prepared Ti 2 InC for the first time by treating Ti/In/TiC in a sealed ampoule at 850°C for 350 h. By sintering a stoichiometric Ti/In/C powder mixture via hot isostatic pressing (HIP) at 1300°C for 7 h, Barsoum et al. [8] successfully synthesized dense Ti 2 InC bulks with~5 vol.% impurity phase of In, and this method has been widely used in the studies of Ti 2 InC [11,12,14]. Cuskelly [15] pioneered the preparation of Ti 2 InC by pressureless sintering method, and the preparation process required sintering a stoichiometric Ti/In/C compressed block at 1300°C for 7 h, obtaining a conversion of 85 wt% with 11 wt% of TiC and 4wt% of In. ...
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