42 Result(s)
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Article
Application of Mössbauer spectroscopy to physical metallurgy: The role of light interstitial elements
Light elements like hydrogen, nitrogen, and carbon, residing on interstitial sites of the host lattice, are capable of inducing noticeable changes in the physical properties of the material affected by their p...
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Article
Mössbauer measurements backscattering technique (CXMS) of laser irradiated cold forming tool steel (X210CR12)
Conversion x-ray Mössbauer measurements (CXMS) in backscattering technique are performed on a commercial cold forming tool steel (X210Cr12), subjected to single-pass laser irradiation. The structure of the aff...
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Article
Mixed hyperfine interaction - A tool to investigate the short range order and the strange magnetic behaviour of amorphous Fe-based binary alloys
The Mössbauer study of the mixed magnetic dipole and electric quadrupole interaction in the paramagnetic state of amorphous Fe−Zr and Fe−Hf alloys is presented. Strong evidence for chemical short range order o...
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Article
Experience with a toroidal proportional detector for backscattered Mössbauer ψ-rays and X-rays
Because backscattering geometry in Mössbauer spectroscopy is particularly useful for non-destructive testing interesting technical applications arise. The reported toroidal proportional detector for backscatte...
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Article
CXMS study of mild steel laser alloyed with CrB2
Laser alloying of surfaces has attracted a great deal of attention for technical applications. By laser alloying of materials it is possible to improve hardness as well as wear and corrosion resistance of the ...
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Article
Simultaneous Triple Radiation Mössbauer Spectroscopy (STRMS)
The setup for Simultaneous Triple Radiation Mössbauer Spectroscopy (STRMS) is described. The arrangement allows an independent and simultaneous recording of conversion electron Mössbauer spectra (CEMS) and of ...
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Article
Surface investigation of excimer laser irradiated phosphatized steel plates
Steel plates (St 14-05) of 1.5 mm thickness and coated with 1.5 μm of ironzinc-phosphatehydrate (ASTM 29-1429) were irradiated with an XeCl-excimer laser (Siemens XP 2020) at energy densities of 20–80 mJ/mm2 and ...
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Article
A simple six-input multichannel system for Mössbauer spectroscopy
A multichannel system for Mössbauer spectroscopy was developed and is presented. The system, constructed as an NIM module, is connected to the DMA port of an ATARI ST computer and can be used for six detectors...
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Article
Study of nanocrystalline and amorphous powders prepared by mechanical alloying
The process of mechanical alloying consists of intimate mixing and mechanical working of elemental powders in a high-energy ball mill. It has been well established that this process is able to produce nanocrys...
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Chapter and Conference Paper
From the Random Sequential Adsorption to the ballistic model
Irreversible adsorption processes are often described by the Random Sequential Adsorption (RSA) model, which has received considerable attention from a theoretical point of view. The validity of this model and...
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Article
Laser nitriding of iron: Nitrogen profiles and phases
Armco iron samples were surface nitrided by irradiating them with pulses of an excimer laser in a nitrogen atmosphere. The resulting nitrogen depth profiles measured by Resonant Nuclear Reaction Analysis (RNRA...
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Article
Structural changes during Ar-ion irradiation of laser-deposited Fe/Ag multilayers
During 350 keV Ar+ irradiation at 77K, laser-deposited Fe−Ag multilayers first show stress relaxation and demixing processes at the interfaces followed by grain coarsening and a supersaturation of the bcc α-Fe ph...
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Article
Laser nitriding of iron: Influence of the laser parameters on the nitriding efficiency
Laser nitriding of Armco iron in nitrogen was studied for KrF-excimer-laser irradiation. The influence of the energy density and number of pulses on the nitrogen take-up and the nitride phases formed was inves...
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Article
Structural and magnetic properties of La/Fe multilayers
The structural and magnetic properties of La/Fe multilayers were investigated by X-ray diffraction, RHEED, magnetometry and57Fe Mössbauer spectroscopy. Comparison is made with previous results obtained for Ce/Fe ...
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Article
Decomposition and crystallization in a zirconium-based bulk amorphous alloy: effects on nuclear probes
Using Mössbauer spectroscopy with 57Fe probes and perturbed angular correlations with ion implanted 111In–111Cd nuclear tracers, we have investigated decomposition and crystallization in the bulk amorphous alloys...
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Article
Ionic and electronic transport in In2S3 studied via perturbed angular correlation spectroscopy
We report on Perturbed Angular Correlation measurements in polycrystalline In2S3 samples in the temperature range from 8 K to 1000 K where two different crystallographic phases β and α occur. As probes, implanted...
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Article
Analysis of laser-nitrided stainless steel via nuclear methods
Laser nitriding of iron and other metals is governed by the complicated interplay of the laser–plasma–liquid surface interactions which lead to a superposition of several mechanisms. This article reports on t...
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Article
Direct synthesis of β-FeSi2 by ion beam mixing of Fe/Si bilayers
The iron di-silicide β-FeSi2 is a promising direct band gap semiconductor but difficult to produce. Here, the successful direct synthesis of this phase by ion beam mixing of Fe/Si bilayers at temperatures in the ...
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Article
Laser-produced iron nitrides seen by Mössbauer spectroscopy
Mössbauer spectroscopy is a very powerful tool to investigate technological processes performed mainly at the surface of materials. Nitriding of metals and steel is well established in surface engineering, and...
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Article
Mössbauer Optimization of the Direct Synthesis of β-FeSi2 by Ion Beam Mixing of Fe/Si Bilayers
At present, there is an increasing interest in the iron di-silicide phase β-FeSi2, which is supposed to be a direct band gap semiconductor and one of the most promising materials for silicon-based optoelectronics...
