Thermal-spikes temperature measurement in pure metals under argon ion irradiation (E = 5-15 keV)

Ovchinnikov, V. V.; Makhin’ko, F. F.; Solomonov, V. I.

doi:10.1088/1742-6596/652/1/012070

Cited by 9 publications

(4 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Section: Introductionmentioning

confidence: 91%

“…The amorphization coincides with the heating of the outer sample surface in the course of the collision cascade (Volkert and Minor, 2007;Fischione et al, 2017) along with the occurrence of so-called "thermal spikes", which can easily reach a few thousand kelvin (Ovchinnikov et al, 2015). Because of the immediate vaporization of the affected volume within 10 −12 s (Ovchinnikov et al, 2015), the thermal effect on the bulk material is rather low. For samples with both good thermal conductivity and good thermal connection, ion beam heating plays a negligible role in the bulk (Volkert and Minor, 2007), but for materials with inefficient heat dissipation (e.g., due to low thermal conductivity, such as in SiO 2 ) a temperature increase up to 500 • C was calculated (Ishitani and Kaga, 1995).…”

Section: Introductionmentioning

confidence: 91%

“…Sample heating also facilitates the occurrence of uncommon types of beam damage, such as preferential sputtering (Volkert and Minor, 2007), which occurs in materials with more than one atom species, especially if the compound can decompose chemically. In-depth information on sample heating (Kim and Carpenter, 1987;Cen and Van Benthem, 2018;Volkert and Minor, 2007;Ovchinnikov et al, 2015;Ishitani and Kaga, 1995), beam damage (Gutierrez-Urrutia, 2017; Mayer et al, 2007;Betz and Wehner, 1983;Prenitzer et al, 2003), and experimental reduction strategies of these effects (Bassim et al, 2012;Barber, 1993) can be found in the cited literature.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Artifacts from manganese reduction in rock samples prepared by focused ion beam (FIB) slicing for X-ray microspectroscopy

Macholdt

Förster

Müller

et al. 2019

Geosci. Instrum. Method. Data Syst.

View full text Add to dashboard Cite

Abstract. The spatial distribution of transition metal valence states is of broad interest in the microanalysis of geological and environmental samples. An example is rock varnish, a natural manganese (Mn)-rich rock coating, whose genesis mechanism remains a subject of scientific debate. We conducted scanning transmission X-ray microscopy with near-edge X-ray absorption fine-structure spectroscopy (STXM-NEXAFS) measurements of the abundance and spatial distribution of different Mn oxidation states within the nano- to micrometer thick varnish crusts. Such microanalytical measurements of thin and hard rock crusts require sample preparation with minimal contamination risk. Focused ion beam (FIB) slicing was used to obtain ∼100–1000 nm thin wedge-shaped slices of the samples for STXM, using standard parameters. However, while this preparation is suitable for investigating element distributions and structures in rock samples, we observed artifactual modifications of the Mn oxidation states at the surfaces of the FIB slices. Our results suggest that the preparation causes a reduction of Mn4+ to Mn2+. We draw attention to this issue, since FIB slicing, scanning electron microscopy (SEM) imaging, and other preparation and visualization techniques operating in the kilo-electron-volt range are well-established in geosciences, but researchers are often unaware of the potential for the reduction of Mn and possibly other elements in the samples.

show abstract

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Artifacts from manganese reduction in rock samples prepared by focused ion beam (FIB) slicing for X-ray microspectroscopy

Macholdt

Förster

Müller

et al. 2019

Geosci. Instrum. Method. Data Syst.

View full text Add to dashboard Cite

show abstract

“…In works [1,3,30,31] it is shown that thermo-and radiation-stimulated diffusion at low temperatures can be replaced by "radiation shaking" of the irradiated material. We are talking about radiation shaking during cascade-forming types of irradiation by powerful elastic and/or shock solitary waves emitted by rapidly expanding nanoscale (r~5 nm) regions of dense cascades of atomic displacements heated quasi-adiabatically (within about 10 −12 s) to 3000-6000 K and higher (the temperatures were measured as a result of the analysis of the spectral composition of the thermal glow of the targets [1,44]). In metastable media, post-cascade waves, passing into a continuous propagation mode, can initiate structural-and-phase transformations at their front theoretically at an unlimited depth [1,30].…”

Section: At% Mn)mentioning

confidence: 99%

Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions

Ovchinnikov

Makarov

Gushchina

2021

Metals

View full text Add to dashboard Cite

The effect of high-pressure torsion (HPT) (P = 8 GPa, e = 5.9) and irradiation with continuous beams of Ar+ ions with energy E = 15 keV on the atomic structure and phase composition of initially quenched iron alloys with 4.10 and 7.25 at.% Mn was studied by the method of Mössbauer spectroscopy. The supersaturated α-solid solution of Fe-7.25 at.% Mn, in contrast to the stable Fe-4.10 at.% Mn, which passes into a highly nonequilibrium metastable state as a result of HPT deformation, is transformed under the influence of ion irradiation at an abnormally low temperature of 280 °C into a two-phase α + γ-state with a highly enriched γ-phase (austenite) (38.4 at.% Mn) and a depleted α-solid solution with 5.76 at.% Mn. The rapid processes with the formation of the γ-phase with a concentration of Mn close to the extrapolation estimate using the equilibrium phase diagram are explained by the cascade radiation shaking of the material by post-cascade powerful elastic and shock waves. Cascade radiation shaking plays the role of temperature and opens up the possibility of achieving states close to equilibrium in the absence of thermally activated processes at record low temperatures.

show abstract

Room Temperature Ion Beam Synthesis of Ultra‐Fine Molybdenum Carbide Nanoparticles: Toward a Scalable Fabrication Route for Earth‐Abundant Electrodes

Fiedler

Malone

Mitchell

et al. 2023

Small

View full text Add to dashboard Cite

Molybdenum carbides are promising low‐cost electrocatalysts for electrolyzers, fuel cells, and batteries. However, synthesis of ultrafine, phase‐pure carbide nanoparticles (diameter < 5 nm) with large surface areas remains challenging due to uncontrollable agglomeration that occurs during traditional high temperature syntheses. This work presents a scalable, physical approach to synthesize molybdenum carbide nanoparticles at room temperature by ion implantation. By tuning the implantation conditions, various molybdenum carbide phases, stoichiometries, and nanoparticle sizes can be accessed. For instance, molybdenum ion implantation into glassy carbon at 30 keV energy and to a fluence of 9 × 1016 at cm−2 yields a surface η‐Mo3C2 with a particle diameter of (10 ± 1) nm. Molybdenum implantation into glassy carbon at 60 keV to a fluence of 6 × 1016 at cm−2 yields a buried layer of ultrafine γ’‐MoC/η‐MoC nanoparticles. Carbon ion implantation at 20 keV into a molybdenum thin film produces a 40 nm thick layer primarily composed of β‐Mo2C. The formation of nanoparticles in each molybdenum carbide phase is explained based on the Mo‐C phase diagram and Monte‐Carlo simulations of ion‐solid interactions invoking the thermal spike model. The approaches presented are widely applicable for synthesis of other transition metal carbide nanoparticles as well.

show abstract

Thermal-spikes temperature measurement in pure metals under argon ion irradiation (E = 5-15 keV)

Cited by 9 publications

References 7 publications

Artifacts from manganese reduction in rock samples prepared by focused ion beam (FIB) slicing for X-ray microspectroscopy

Artifacts from manganese reduction in rock samples prepared by focused ion beam (FIB) slicing for X-ray microspectroscopy

Structural-and-Phase Transformations in Fe-4.10 and 7.25 at.% Mn Alloys under Intensity External Actions

Room Temperature Ion Beam Synthesis of Ultra‐Fine Molybdenum Carbide Nanoparticles: Toward a Scalable Fabrication Route for Earth‐Abundant Electrodes

Contact Info

Product

Resources

About