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In this work, we studied the selenization processes of sputtered Cu/In stacked layers with two different kinds of Selenium (Se) sources: Se pellets (A) and an evaporated layer (B). Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), Grazing Incidence X-Ray Diffraction (GIXRD) and Raman spectroscopy were used to characterize the selenized films. In the group A, elemental Se...
In this paper, martensite transformation induced by plasma nitrocarburizing in AISI304 austenitic stainless steel is investigated. The optical micrographs and XRD results indicate the dual-layer structure of the nitrocarburized layer: the outer martensite transformation layer and the inner C supersaturated austenite layer. The initial transformation microstructure presents as nanoscale qusai-pealite...
Atomistic simulations were used to study irradiation effects on photoluminescence (PL) decay time of GaN. Irradiations were done by single (F, P) and molecular ions (PF 4 ). Equal energy per mass (0.6 keV/amu) was used for all projectiles. Irradiation by the molecular ion shows faster PL decay time in comparison with the single ion. The simulation results show that single ions produce isolated...
NCO-terminated polybutadiene based liquid crystalline polyurethane films were irradiated with O 7+ ion beam at various fluences ranging 3 × 10 10 to 1 × 10 12 ions/cm 2 . Significant modifications in the structural, optical and chemical properties have been observed after irradiation. UV-visible spectra show a shift toward the higher wavelength regime after irradiation...
A novel technology was developed to remove impurities from crude lead with high impurities by vacuum distillation. Refined lead (purity over 99%) was achieved through vacuum distillation using crude lead (92.88%) with high impurities as input material under a dynamic vacuum of 5–15 Pa. The results show that vacuum distillation should be taken to obtain lead from crude lead matrix, in which low-volatile...
A set-up for co-deposition of lithium–deuterium mixed films and in situ thermal desorption spectroscopy is described. The set-up consists of a HV chamber with a magnetron discharge for Li–D co-deposition, UHV chamber for thermal desorption measurements and a sample transfer system between the chambers. It was found that a large amount of deuterium was accumulated in the lithium films. Deuterium thermal...
Intrinsic monolayer graphene has no band gap between its conduction and valence bands, which limits its application in many aspects as a semiconductor. Antidot lattices by constructing periodic holes on graphene have been proved to be an intriguing strategy to introduce a band gap into graphene. Here we used the e-beam lithography (EBL) combined with the oxygen reactive ion etching (RIE) to fabricate...
The mechanisms of sputtering of nanoparticles embedded in the solid matrix under ion bombardment are presented. The mechanism of sputtering by multicharged ions is based on the increase of the potential energy associated with the Coulomb interaction of charges. It is shown that the increase of the lifetimes of holes formed under ionization of the material in the track of the nanoparticles enlarges...
In the present research work, the vulnerability of silicon doped polyimide by atomic oxygen present in LEO (lower earth orbit) of space was investigated. AO-exposure of a fluence of 5.4 × 101 8 atoms cm −2 significantly changed the surface resistivity properties of polyimide which is a prime factor governing spacecraft surface charging problem. This amount of fluence affected surface...
4H-SiC was implanted with He + , B + and Mg + ions over a wide range of ion fluences at 15 K. Damage analysis was performed with Rutherford backscattering spectrometry in channelling configuration. Cross-sections of direct-impact-damage formation and stimulated growth of damage were extracted by fitting model curves to the maximum damage concentration versus the ion fluence...
In this research article deep level green luminescence quenching, stability of ultraviolet excitonic emission and structural properties of composite (ZnO) 1−x (Cr 2 O 3 ) x (x = 0, 5, 10 and 15 mol%) are investigated. X-ray diffraction has demonstrated polycrystalline wurtzite structured ZnO and established proper incorporation of Cr 3+ at most likely on the...
The article presents the results of the study of the composition and selected functional properties of Al–Cu–Mg alloys modified by RF CVD technique (Radio-Frequency Chemical Vapor Deposition). The type and composition of the deposited SiNH and carbon doped SiNH layers was altered in the experiments. The samples were pre-treated with argon plasma etching and N + ion implantation.On the basis...
Within the framework of the classical radiative transfer theory [1–3], signal shaping of the most recently needed method of electron spectroscopy – X-ray Photoemission Spectroscopy (XPS) is analyzed. The boundary problem for the photoelectron transfer equation is solved on the basis of invariant embedding methods. Approximate analytical solutions of the derived equations are determined using the spherical...
The aim of the study is to reveal the damage mechanisms of a plain woven carbon fiber cloth reinforced silicon carbide composite (2D-C/SiC) under interlaminar shear stress at elevated temperature. The interlaminar shear tests were carried out by compression of a double-notched specimen. Damage mechanisms were revealed by loading/unloading experiments. The damage evolution mainly involves the initiation...
We present results of adsorption experiments of Sn and 1,4-benzenedimethanethiol (BDMT) on Cu(001), which illustrate the capabilities of a new setup specifically designed to perform surface studies by Direct Recoil Spectroscopy (DRS). The system consists of three UHV chambers connected in series with a 1–100 keV ion accelerator. In the main UHV chamber the DRS technique is combined with other more...
The main parameters of ion-photon emission (IPE) during bombardment of yttrium aluminum garnet (YAG – Y 3 Al 5 O 12 ) with Ar + ions were determined. An essential difference was found in the spectral composition of the emission from YAG in comparison with that of constituent metals (Al and Y). It was supposed that the difference in the spectra of IPE is due to the different...
Glass microspheres were treated with purified water to observe the formation of capillary bridges between the contacting microspheres using high resolution environmental scanning electron microscopy. The observed bridges between glass microspheres were found to shrink under exposure to the electron beam showing evidence of the gelatinous nature while identical experiments with gold spheres did not...
SiO 2 layers thermally grown on Si wafers were irradiated with swift heavy ions in the energy range of (20–710) MeV. Subsequent chemical etching in 4% HF for 6 min produced conical pores with diameters from ∼20 to ∼80 nm in the SiO 2 layers. We have calculated radii and lifetime of the molten regions in the SiO 2 layers and compared them with the pore diameters and diameter...
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