Temporal evolution of Ge surface topography under keV ion irradiation: Combined effects of curvature-dependent sputter erosion and atomic redistribution

Datta, D.P.; Garg, S.K.; Basu, Tanmoy; Satpati, Biswarup; Hofsäß, H.; Kanjilal, D.; Som, T.

doi:10.1016/j.apsusc.2015.10.133

Cited by 23 publications

(24 citation statements)

References 55 publications

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“…Numerical integrations of the PB equation of motion reveal that the cubic term can have a profound effect on the dynamics -it can lead to the formation of a terraced topography that coarsens with time, in accord with experimental observations [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. The regions in which the surface slope changes rapidly are undercompressive shocks [22].…”

Section: Introductionsupporting

confidence: 52%

“…x and u x u 2 y in the EOM can yield surface morphologies that resemble those observed in various experiments. Among these are elongated pyramidal structures [8,20] and lenticular depressions [18]. We also compare the predictions from the 1D theory with our simulations in 2D when there is smoothing in the transverse direction and find that key predictions from 1D carry over to 2D.…”

Section: Terracing In Two Dimensionsmentioning

confidence: 69%

“…In experiments in which the ion beam is reasonably close to grazing incidence, the surface frequently develops a terraced form at the late stages of its time evolution [7][8][9][10][11][12][13][14][15][16][17][18][19][20]. A height profile taken along the projected ion direction is not sinusoidal.…”

Section: Introductionmentioning

confidence: 99%

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Emergence and detailed structure of terraced surfaces produced by oblique-incidence ion sputtering

2017

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We study the nanoscale terraced topographies that arise when a solid surface is bombarded with a broad ion beam that has a relatively high angle of incidence θ. We find that the surface is not completely flat between the regions in which the surface slope changes rapidly with position: Instead, small-amplitude ripples propagate along the surface. Our analytical work on these ripples yields their propagation velocity as well as the scaling behavior of their amplitude. Our simulations establish that the surfaces exhibit interrupted coarsening, i.e., the characteristic width and height of the surface disturbance grow for a time but ultimately asymptote to finite values as the fully terraced state develops. In addition, as θ is reduced, the surface can undergo a transition from a terraced morphology that changes little with time as it propagates over the surface to an unterraced state that appears to exhibit spatiotemporal chaos. For different ranges of the parameters, our equation of motion produces unterraced topographies that are remarkably similar to those seen in various experiments, including pyramidal structures that are elongated along the projected beam direction and isolated lenticular depressions.

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Section: Introductionsupporting

confidence: 52%

Section: Terracing In Two Dimensionsmentioning

confidence: 69%

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Emergence and detailed structure of terraced surfaces produced by oblique-incidence ion sputtering

2017

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“…The ion irradiation-induced surface shows microstructures with similar feature sizes, well-defined vertical roughness, and lateral periodicity. Such characteristics have been observed in single element materials such as Si, Ag, Al, Cu, Pt, and Ge, 26 but have never been in SiC. The cause is the implantation of the incident ions, the cascading collision of the targeted atoms, the sputtering of the atoms, and the diffusion of the induced interstitials and vacancies, which modify and reorganize the surface microstructures.…”

Section: Surface Morphologymentioning

confidence: 99%

Ion irradiation effect on spark plasma sintered silicon carbide ceramics with nanostructured ferritic alloy aid

Ning

2018

J Am Ceram Soc

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Silicon carbide (SiC) is a promising material with excellent chemical and physical performance under irradiation for advanced nuclear applications. The addition of nanostructured ferritic alloy (NFA) has been proven beneficial for the densification of SiC ceramics based on our previous work. To understand their microstructural evolution and irradiation resistance, spark plasma sintered (SPSed) SiC ceramics with and without NFA aid (0 vol% NFA-100 vol% SiC, 2.5 vol% NFA-97.5 vol% SiC, and 5 vol% NFA-95 vol% SiC) were exposed to 5 MeV Si ++ irradiation. The ion irradiation strongly modifies the surface morphology with isolated sand dune shaped structures, which can be explained by the Bradley-Harper (B-H) theory. SRIM simulation for both the pure SiC and NFA-SiC predicts similar surface damage of~45 dpa and peak damage of~790 dpa at~2.0 lm depth. For the actual samples, the SiC matrix is completely amorphous up to~2.2 lm thickness (from the surface dune valley to the amorphous layer boundary), which is consistent with the SRIM predicted depth of~2.3 lm. Reaction product (Fe, Cr) 3 Si in the NFA-SiC samples maintains a crystalline structure with dislocation loops. A defect rate model is applied to understand the fundamental difference in ion irradiation resistance between SiC and (Fe,Cr) 3 Si. K E Y W O R D S defects, microstructure, nanostructured ferritic alloy aid, Si ++ ion irradiation, silicon carbideHow to cite this article: Ning K, Lu K. Ion irradiation effect on spark plasma sintered silicon carbide ceramics with nanostructured ferritic alloy aid.

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“…Ar) with a target (e.g. Ti6Al4V) and allows dynamical changes within the target (the incorporation of projectile atoms, atomic mixing as well as preferential sputtering) [55][56][57][58]. In addition, it does not have the drawbacks that existed in TRIM, such as wrong angular distribution of sputtered atoms for targets containing low atomic number (Z) elements with Z < 14 and overestimation of the high angle sputtering yield [59].…”

Section: Modelling With Sdtrimspmentioning

confidence: 99%

Large current ion beam polishing and characterization of mechanically finished titanium alloy (Ti6Al4V) surface

Zhou

et al. 2019

Applied Surface Science

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Ti6Al4V samples with a surface roughness of about 0.2 μm were polished by a high fluence ion beam source, and influences of the ion current, energy and incident angle on the surface roughness of Ti6Al4V were studied. The as-polished surfaces were characterized by laser scanning confocal microscopy (LSCM), atomic force microscopy (AFM), grazing incidence X-ray diffraction (GIXRD) and X-ray photoelectron spectroscopy (XPS). The LSCM images revealed that the density of pits in the original surface decreased greatly after the ion polishing process. In addition, the surface roughness calculated from these images proved that the mean value reduced to 53 nm with an ion energy, current and incident angle of 600 eV, 130 mA and 75°, respectively. The smoothing effect was also confirmed by the power spectral density (PSD) functions calculated from the AFM data. GIXRD patterns indicated that the Ti6Al4V samples mainly contain the hexagonal close packed (HCP) α-Ti, no recognizable peaks corresponding to the body centered cubic (BCC) β-Ti were observed. Furthermore, after the ion beam polishing process, the phase of all the as-polished samples kept steady. The XPS results revealed that C, O, Ti, Al and V were present in both the original as well as the polished samples. In addition, due to the highly reactive characteristics of Ti, Al and V elements, a higher signal for oxygen can also be observed on the outermost surface of the ion beam polished samples. The polishing process of Ti6Al4V surface bombarded by Ar ion beam is also simulated by binary collision approximation (BCA) code SDTrimSP, the effects of ion beam energy and incident angle on the sputtering yield were investigated. The results showed that the sputtering yield of Ti, Al and V atoms increased almost linearly with the ion energy. However, as for the influence of ion incident angle, the sputtering yield first increased gradually from 0° and peaked at about 65°, then decreased rapidly because the incident angle is too large for Ar ion to penetrate into the surface of Ti6Al4V sample.

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Temporal evolution of Ge surface topography under keV ion irradiation: Combined effects of curvature-dependent sputter erosion and atomic redistribution

Cited by 23 publications

References 55 publications

Emergence and detailed structure of terraced surfaces produced by oblique-incidence ion sputtering

Emergence and detailed structure of terraced surfaces produced by oblique-incidence ion sputtering

Ion irradiation effect on spark plasma sintered silicon carbide ceramics with nanostructured ferritic alloy aid

Large current ion beam polishing and characterization of mechanically finished titanium alloy (Ti6Al4V) surface

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