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Experimental X-ray investigations of changes at the “solid-solid interface” boundary after pulsed focused laser irradiation
摘要： Investigated in this work were plates of Zerodur connected to a solid monolith block with the aluminum nanolayer of the 100-nm thickness. The object of the study was this nanolayer that changed its optical transparency under action of pulsed laser radiation. Zerodur plate located on the back side after ablation was step-by-step thinned by grinding and polishing up to the boundary with aluminum nanolayer. After each thinning step, we performed the X-ray phase analysis by using the diffractometer Philips X’Pert PRO – MRD. Used in this study was Cu Kal emission line with the wavelength k = 0.15405980 nm). The anode potential was 45 kV, and current – 40 mA. It has been ascertained that the changes in phase composition are present within the region of 50(cid:1) (cid:1) (cid:1)100 nm from the aluminum nanolayer boundary. It has been found the appearance of the weak but sharp peak at 28.4(cid:1) that corresponds to the re?ection (1 1 1) of cubic silicon nanoparticles. Their size is approximately 12 nm. It was revealed the weakly pronounced but clear peak at 44.78(cid:1) that corresponds to the re?ection (2 0 0) attributed to cubic aluminum.
关键词： Zerodure,Nanoparticles,X-ray techniques,Laser ablation,Thin ?lms,Laser processing
更新于2025-09-19 17:13:59
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The self-assembly of DyF3 nanoparticles synthesized by chloride-based route
摘要： The series of DyF3 nanoparticles was synthesized for the first time by a chloride-based route, using the water-soluble dysprosium chloride hexahydrate as a precursor. The synthesized nanoparticles have sizes of 3 to 7 nm, which is the smallest reported size for DyF3 nanoparticles. The influence of precursor concentration in an aqueous solution prior to the chemical reaction on the size of nanoparticles was studied. The influence of microwave-assisted hydrothermal treatment was also studied. The analysis of transmission electron microscopy (TEM) data revealed no correlation between the size of synthesized nanoparticles and the concentration of the aqueous solution. The AC/DC magnetic susceptibility of DyF3 nanoparticles was measured. The dipolar ferromagnetic transition for this sample was not observed down to 1.8 K that can be possibly explained by onset of superparamagnetism. The self-assembly of DyF3 nanoparticles was observed for the first time by analysis of XRD and TEM data and the evidence of superlattice formation along (020) and (210) lattice planes over the size of 20–30 nm (4–5 nanoparticles) was obtained.
关键词： X-ray techniques,Self-assembly,Nanocrystalline materials,Colloidal processing,Crystal structure,Electron microscopy
更新于2025-09-04 15:30:14