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  • Articles  (335)
  • 2010-2014  (335)
  • 2011  (335)
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  • Articles  (335)
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  • 2010-2014  (335)
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  • 1
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    Growth of β-FeSi2thin films on silicon (100) substrate for different annealing time by pulsed laser deposition (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-30
    Description: Publication year: 2011 Source: Vacuum, Available online 27 December 2011 S.C. Xu, S.B. Gao, B.Y. Man, C. Yang, M. Liu, ... Single-phase β-FeSi2films were fabricated on silicon (100) substrates by pulsed laser deposition (PLD) technique and post-annealing process. The X-ray diffraction (XRD) showed that the diffraction intensity reached a certain threshold and then decreased with the increase of annealing time. The scanning electron microscopy (SEM) observations revealed surface morphologies of the films for different annealing time. The optimal photoluminescence (PL) of the films were obtained after 9 h annealing process. Based upon all the experimental results, it was found that the luminous properties were associated with the crystalline quality and surface morphologies. Highlights ► β-FeSi 2 films were fabricated on silicon (100) substrates by PLD and post-annealing. ► XRD intensity reached a threshold and then decreased as annealing time increased. ► SEM revealed a smooth surface after 9 h annealing. ► optimal photoluminescence were obtained after 9 h annealing process. ► PL properties were associated with the crystalline quality and surface morphologies.
    Print ISSN: 0042-207X
    Electronic ISSN: 1879-2715
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 2
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    Performance increase in turbomolecular pumps with curved type blades (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-24
    Description: Publication year: 2011 Source: Vacuum, Available online 22 December 2011 Nevsan Şengil Mostly, flat type blades are used in the turbomolecular pumps in both rotor and stator sections. In this study, performance characteristics of the turbomolecular pumps consist of one rotor or rotor-stator pair with flat type blades is calculated in different flow regimes. Next, the same calculations are realized for the curved type blades in dissimilar geometries. Following, these performance characteristics are compared to find out which combination is the most efficient in terms of maximum pumping speed and maximum compression ratio. In case of turbomolecular pump consists of only one rotor, flat blades give the best performance. However in rotor-stator pairs, the performance of the flat type only blades is surpassed by a combination of rotor with flat type blades and stator with curved type blades. Consequently, it is concluded that curved type blades should also be considered in stator sections in addition to the flat type blades in order to increase the performance of the multi-stage turbomolecular pumps. Highlights ► Mostly, flat type blades are used in the turbomolecular pumps. ► Differently shaped blades are proposed in this study. ► Performances of the flat type and curved type blades are compared. ► Flat type blades should be used in the rotor sections. ► Curved type blades should be considered in the stator sections.
    Print ISSN: 0042-207X
    Electronic ISSN: 1879-2715
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 3
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    The study of graphite disordering using the temperature dependence of ion-induced electron emission (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 N.N. Andrianova, V.S. Avilkina, A.M. Borisov, E.S. Mashkova, E.S. Parilis The temperature dependences of ion-induced electron emission yield γ(T) under 6 - 30 keV N2, Ne, Arand 15 keV Nhigh-fluence ion irradiation of polycrystalline graphite at normal ion incidence have been analyzed to trace the structure change dependence depending on irradiation temperature and the level of radiation damage ν measured indpa(displacements per atom). It has been found that, under irradiation at room temperature, the threshold value for graphite lattice disordering equals νd≈ 60dpafor noble gas ions (Ar, Ne) and νd≈ 40dpafor N2.2011 Elsevier B.V. All rights reserved.
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    Electronic ISSN: 1879-2715
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 4
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    Nanoindention study of indium nitride thin films grown using RF plasma-assisted molecular beam epitaxy (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 Chien-Huang Tsai In this study, we used an RF plasma–assisted molecular beam epitaxy (RF-MBE) system to grow single-crystalline indium nitride (InN) films onto aluminum nitride (AlN) buffer layers on Si (111) substrates. We then used nanoindentation techniques and reflection high-energy electron diffraction (RHEED) to study the influence of thec-axis–oriented InN films on the mechanical performance. From morphological observations, we compared the stiffness and resistance against contact-induced damage of the InN films in the presented shrinkage of the area. InN films prepared at growth temperatures of 440, 470, and 500 °C had nanohardnesses (H) of 3.6 ± 0.2, 4.5 ± 0.25, and 9.1 ± 0.8 GPa, respectively, and Young’s moduli (E) of 97.4 ± 1.2, 147.7 ± 1.8, and 176.0 ± 2.3 GPa, respectively. Highlights ► We used an RF-MBE system to grow single-crystalline InN. ► A high growth temperature enhanced the H and E values of the InN films. ► H and E was depended on the strongly c-axis–oriented In-N bond.
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    Electronic ISSN: 1879-2715
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 5
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    Characteristic features of ion-photon emission from yttrium-iron garnets (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 V.V. Bobkov, I.A. Afanas’eva, V.V. Gritsyna, V.T. Gritsyna, D.A. Ryzhov, ... The main parameters of the ion-photon emission (IPE) arising from the bombardment of yttrium-iron garnets (YIG) samples with Ar-ions were studied. The essential difference in the spectral composition, quantum yield of emissions, and spatial distribution of radiation registered from YIG to that from samples of pure metal iron was determined. Such difference in parameters of IPE is due to contribution of new mechanisms of formation of excited particles leaving the sample during ion bombardment YIG compared with emission from a metal. It was suggested the excited atoms are formed during the decay of MemOncomplexes ejected from solids. Highlights ► We have determined the characteristic features of ion-phonon emission from yttrium-iron garnets. ► The most intense lines are emitted by slow (∼10 eV) iron atoms excited in specific states. ► The quantum yield of iron atom lines from garnets depends on the content of additives. ► It is suggested that excited atoms are formed during decay of Me m O n complexes ejected from the solids.
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    Electronic ISSN: 1879-2715
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 6
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    Opening address by Professor V.E.Yurasova to the 20th Ion-Surface interaction conference. Zvenigorod, Russia (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 V.E. Yurasova
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    Electronic ISSN: 1879-2715
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 7
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    Formation of Mn-oxide clusters in Mn+-implanted SiO2 probed by soft x-ray emission and absorption spectroscopy (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 D.A. Zatsepin, A. Moewes, N.V. Gavrilov, E.Z. Kurmaev, S.O. Cholakh Mn-implanteda-SiO2-samples were studied with the help of soft x-ray emission and absorption spectroscopy (SiL2,33d3s→ 2p3/2,1/2and MnL2,33d4s→ 2p3/2,1/2emission transitions) using synchrotron excitation. The samples were obtained using a pulsed ion source (ion beam current density ∼ 2 – 7 mA/cm,Eimpl.= 30 keV, ion fluence ∼ 2 × 10cm, pulse duration 400 μs) without thermal annealing. It was established that Mn-ion provides a formal valence state 2+, so arranging in implanteda-SiO2the low-sized MnO antiferromagnetic clusters probably of crystalline type. The data obtained well coincides with the electronic spin resonance results reported earlier. Highlights ► The pulsed Mn-implanted a -SiO 2 samples were studied with the help of soft x-ray emission and absorption spectroscopy. Our results demonstrate the formation of low-sized MnO antiferromagnetic clusters probably of crystalline type in a -SiO 2 that does not contradict the spin resonance data.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 8
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    Si nanocrystals formation in SiO2by ion implantation: The effects of RTA and UV irradiation on photoluminescence (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 T.S. Iwayama Si ion implantation was widely used to synthesize specimens of SiO2containing supersaturated Si and subsequent high temperature annealing induces the formation of embedded luminescent Si nanocrystals. In this work, the potentialities of excimer UV-light (172 nm, 7.2 eV) irradiation and rapid thermal annealing (RTA) to enhance the photoluminescence and to achieve low temperature formation of Si nanocrystals have been investigated. The Si ions were introduced at acceleration energy of 180 keV to fluence of 7.5 x 10ions/cm. The implanted samples were subsequently irradiated with an excimer-UV lamp. After the process, the samples were rapidly thermal annealed before furnace annealing (FA). Photoluminescence spectra were measured at various stages at the process. We found that the luminescence intensity is strongly enhanced with excimer-UV irradiation and RTA. Moreover, effective visible photoluminescence is found to be observed even after FA at 900 °C, only for specimens treated with excimer-UV lamp and RTA. Based on our experimental results, we discuss the effects of excimer-UV lamp irradiation and RTA process on Si nanocrystals related photoluminescence.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 9
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    Molecular effect on surface topography of GaN bombarded with PF4ions (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 A.I. Titov, P.A. Karaseov, V.S. Belyakov, K.V. Karabeshkin, A.V. Arkhipov, ... We study surface topography and thickness of GaN layers implanted at room temperature with 1.3 keV/amu F, P, and PF4cluster ions. Results show that the density of collision cascades has a dramatic effect on the surface roughness and the thickness of implanted layers. Surface roughness increases with increasing cascade density. For very dense cascades produced by PF4ions, the evolution of layer thickness is dominated by ion-induced sputtering. In contrast, for the case of P ions producing less dense cascades, ion-induced swelling is observed.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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  • 10
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    Decoherence in grazing scattering of fast H and He atoms from a LiF(001) surface (2011)
    Elsevier
    In: Vacuum
    Details
    Publication Date: 2011-12-18
    Description: Publication year: 2011 Source: Vacuum, Available online 17 December 2011 M. Busch, J. Lienemann, J. Seifert, A. Schüller, H. Winter The influence of decoherence on the diffraction during grazing scattering of fast hydrogen and helium atoms from a LiF(001) single crystal surface with projectile energies of some keV, is investigated by two-dimensional angular distributions for scattered projectiles in coincidence with their energy loss and emitted electrons from the target surface. For keV hydrogen atoms, we identify the excitations of electrons and excitons of the target surface as the dominant mechanisms for decoherence, whereas for keV helium atoms these contributions are negligibly small. The suppression of electronic excitations owing to the band gap of insulators plays an essential role for preserving quantum coherence and thus for the application of fast atom diffraction as a surface analytical tool.
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
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