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Thin 160Gd targets (enrichment 98.12%) in the thickness range of 45–55 μg/cm2 have been prepared on carbon backing in the high vacuum environment using thermal evaporation technique. During the fabrication, a few of the challenges faced were the oxidizing tendency of Gd in the atmosphere, limited amount of enriched material and the peeling off problem during floating of the films. Several trials were...
Importance of substrate heating for fabrication of strong zirconium targets (92Zr) has been discussed. The targets have been prepared using experimental facilities of target laboratory at Inter University Accelerator Centre (IUAC), New Delhi, India. Substrate heating has been tried for the first time for the fabrication of carbon backed zirconium targets. The heating of substrate exhibited improved...
Thin, durable, uniform, isotopic targets of 193Ir, 187Re, 182W, 181Ta, 175Lu and 169Tm of thicknesses ∼80 μg/cm2, 60 μg/cm2, 70 μg/cm2, 175 μg/cm2, 110 μg/cm2 and 270 μg/cm2, respectively, have been fabricated on carbon backing by physical vapor deposition technique for nuclear reaction studies at Inter University Accelerator Centre (IUAC), New Delhi. Preparation of very thin self-supporting targets...
138Ba enriched isotopic targets, of thickness ranging from 200 μg/cm2 - 240 μg/cm2, with carbon sandwich have been fabricated from barium metal, by high vacuum evaporation technique at Inter-University Accelerator Centre (IUAC), New Delhi. Resistive heating and electron beam evaporation methods were used for the deposition of barium and carbon respectively. 138Ba being a highly reactive metal, target...
The present work investigates the local electronic structure of magnetic Fe/MgO/Fe/Co multilayer structure by using angle dependent near-edge X-ray absorption fine structure (NEXAFS) spectroscopy. The multilayer stack was grown on Si(100) substrates using electron-beam evaporation. X-ray diffraction study reveals the polycrystalline nature of different layers in the stack. Transmission electron microscopy...
This article reports a comprehensive study on damage evolution in undoped InP due to 100 MeV silver (Ag 7+ ) ion irradiation. Raman and Rutherford back scattering channeling (c-RBS) measurements are employed to bring out two different aspects of disorder in the system. While Raman spectroscopy revealed a monotonic increase in sub-surface strain due to ion irradiation, the later detected heavy...
In the present work, we have studied the nano/micro-patterning of the surface of NiO thin films on different substrates (SiO 2 , Si and Al) using 100 MeV Ag ions at LN 2 temperature and at an incidence angle of 75 ° with the beam axis. The surface morphology of the irradiated surface is observed by Atomic force microscopy (AFM). AFM images of ion beam irradiated samples show...
Ni:SiO 2 granular films have been prepared by atom beam sputtering technique under ambient conditions. These films have been subsequently annealed at 200–600°C temperature. GAXRD and TEM analyses show the growth of Ni particles and improvement in crystallinity with increase in annealing temperature. Selected area electron diffraction and XPS analyses show the presence of a small quantity of...
Ion beam mixing has emerged as a technique for understanding reactivity and chemistry at metal/Si interface and may find its applications in the field of microelectronics. We have investigated ion beam mixing at Co/Si interface induced by electronic excitation using 120MeV Au +9 ion irradiation at different fluences, varying from 10 12 to 10 14 ions/cm 2 . Mixing was...
Surface modification and characterization are being undertaken increasingly using the MeV heavy ion beams. Interpretation of such data requires reliable and precise values of stopping powers involved. Sufficient data exists above 2.5 MeV/n but less information is available at lower energies. The present series of experiments report the results of stopping power measurements for various ion species...
The influence of the initial phase composition on the microhardness of 304 stainless steel before and after boron ion implantation has been studied. The initial phase composition is influenced by the specimen preparation methods used and has been determined using Glancing Angle X-ray Diffraction (GAXD). Electropolishing resulted in purely austenitic (fcc) specimens. Electropolishing followed by mechanical...
The content of hydrogen and its depth profile in diamond like carbon (DLC) films deposited by the microwave plasma deposition technique is determined by Elastic Recoil Defection Analysis (ERDA) using 85 MeV i 58 Ni ions. Simultaneous detection of hydrogen and carbon recoils provided a method to determine the relative number of hydrogen:carbon atoms without using a standard H sample for...
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