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  1. Article ; Online: Ion irradiation induced strain and structural changes in LiTaO

    Zhang, F X / Velisa, G / Xue, H / Sellami, N / Trautmann, C / Zhang, Y / Weber, W J

    Journal of physics. Condensed matter : an Institute of Physics journal

    2021  Volume 33, Issue 18

    Abstract: ... ...

    Abstract LiTaO
    Language English
    Publishing date 2021-04-23
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/abee3a
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Local structure of Ni

    Zhang, F X / Tong, Y / Velisa, G / Bei, H / Weber, W J / Zhang, Yanwen

    Journal of physics. Condensed matter : an Institute of Physics journal

    2019  Volume 32, Issue 7, Page(s) 74002

    Abstract: The local structure of ... ...

    Abstract The local structure of Ni
    Language English
    Publishing date 2019-11-01
    Publishing country England
    Document type Journal Article
    ZDB-ID 1472968-4
    ISSN 1361-648X ; 0953-8984
    ISSN (online) 1361-648X
    ISSN 0953-8984
    DOI 10.1088/1361-648X/ab5388
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Ion mass dependence of irradiation-induced damage accumulation in KTaO3

    Velişa, Gihan / Elke Wendler / Liang-Ling Wang / William J. Weber / Yanwen Zhang

    Journal of materials science. 2019 Jan., v. 54, no. 1

    2019  

    Abstract: Damage production and amorphization resulting from the interaction of medium-energy (from 40 to 480 keV) noble-gas ions (from He to Kr) with potassium tantalate (KTaO3) are determined using ion channeling measurements. A disorder accumulation model has ... ...

    Abstract Damage production and amorphization resulting from the interaction of medium-energy (from 40 to 480 keV) noble-gas ions (from He to Kr) with potassium tantalate (KTaO3) are determined using ion channeling measurements. A disorder accumulation model has been fit to the maximum damage concentration versus ion fluence to extract the cross sections for direct-impact and defect-stimulated amorphization, and the results indicate that defect-stimulated amorphization is the dominant mechanism. These cross sections exhibit a strong dependence on the calculated cross sections for displacing lattice atoms, indicating a dominant contribution of nuclear interactions to the defect production and amorphization processes under the irradiation conditions used in this study. These experimental findings, along with the model fits, suggest that the difference in recoil spectra between He and the other heavier ions may be the main driving force for the decreased damage efficiency observed for He ions, which results in a reduced rate of damage accumulation.
    Keywords ions ; irradiation ; models ; potassium
    Language English
    Dates of publication 2019-01
    Size p. 149-158.
    Publishing place Springer US
    Document type Article
    ZDB-ID 2015305-3
    ISSN 1573-4803 ; 0022-2461
    ISSN (online) 1573-4803
    ISSN 0022-2461
    DOI 10.1007/s10853-018-2864-5
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  4. Article ; Online: Simulation of Rutherford backscattering spectrometry from arbitrary atom structures.

    Zhang, S / Nordlund, K / Djurabekova, F / Zhang, Y / Velisa, G / Wang, T S

    Physical review. E

    2016  Volume 94, Issue 4-1, Page(s) 43319

    Abstract: Rutherford backscattering spectrometry in a channeling direction (RBS/C) is a powerful tool for analysis of the fraction of atoms displaced from their lattice positions. However, it is in many cases not straightforward to analyze what is the actual ... ...

    Abstract Rutherford backscattering spectrometry in a channeling direction (RBS/C) is a powerful tool for analysis of the fraction of atoms displaced from their lattice positions. However, it is in many cases not straightforward to analyze what is the actual defect structure underlying the RBS/C signal. To reveal insights of RBS/C signals from arbitrarily complex defective atomic structures, we develop here a method for simulating the RBS/C spectrum from a set of arbitrary read-in atom coordinates (obtained, e.g., from molecular dynamics simulations). We apply the developed method to simulate the RBS/C signals from Ni crystal structures containing randomly displaced atoms, Frenkel point defects, and extended defects, respectively. The RBS/C simulations show that, even for the same number of atoms in defects, the RBS/C signal is much stronger for the extended defects. Comparison with experimental results shows that the disorder profile obtained from RBS/C signals in ion-irradiated Ni is due to a small fraction of extended defects rather than a large number of individual random atoms.
    Language English
    Publishing date 2016-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2844562-4
    ISSN 2470-0053 ; 2470-0045
    ISSN (online) 2470-0053
    ISSN 2470-0045
    DOI 10.1103/PhysRevE.94.043319
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article: Nanoscale Control of Structure and Composition for Nanocrystalline Fe Thin Films Grown by Oblique Angle RF Sputtering.

    Gheorghiu, Cristina C / Ionescu, Aurelia / Zai, Maria-Iulia / Iancu, Decebal / Burducea, Ion / Velisa, Gihan / Vasile, Bogdan S / Ianculescu, Adelina C / Bobeica, Mariana / Popa, Daniel / Leca, Victor

    Materials (Basel, Switzerland)

    2022  Volume 15, Issue 17

    Abstract: The use of Fe films as multi-element targets in space radiation experiments with high-intensity ultrashort laser pulses requires a surface structure that can enhance the laser energy absorption on target, as well as a low concentration and uniform ... ...

    Abstract The use of Fe films as multi-element targets in space radiation experiments with high-intensity ultrashort laser pulses requires a surface structure that can enhance the laser energy absorption on target, as well as a low concentration and uniform distribution of light element contaminants within the films. In this paper, (110) preferred orientation nanocrystalline Fe thin films with controlled morphology and composition were grown on (100)-oriented Si substrates by oblique angle RF magnetron sputtering, at room temperature. The evolution of films key-parameters, crucial for space-like radiation experiments with organic material, such as nanostructure, morphology, topography, and elemental composition with varying RF source power, deposition pressure, and target to substrate distance is thoroughly discussed. A selection of complementary techniques was used in order to better understand this interdependence, namely X-ray Diffraction, Atomic Force Microscopy, Scanning and Transmission Electron Microscopy, Energy Dispersive X-ray Spectroscopy and Non-Rutherford Backscattering Spectroscopy. The films featured a nanocrystalline, tilted nanocolumn structure, with crystallite size in the (110)-growth direction in the 15-25 nm range, average island size in the 20-50 nm range, and the degree of polycrystallinity determined mainly by the shortest target-to-substrate distance (10 cm) and highest deposition pressure (10
    Language English
    Publishing date 2022-09-04
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2487261-1
    ISSN 1996-1944
    ISSN 1996-1944
    DOI 10.3390/ma15176134
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Local Structure and Short-Range Order in a NiCoCr Solid Solution Alloy.

    Zhang, F X / Zhao, Shijun / Jin, Ke / Xue, H / Velisa, G / Bei, H / Huang, R / Ko, J Y P / Pagan, D C / Neuefeind, J C / Weber, W J / Zhang, Yanwen

    Physical review letters

    2017  Volume 118, Issue 20, Page(s) 205501

    Abstract: Multielement solid solution alloys are intrinsically disordered on the atomic scale, and many of their advanced properties originate from the local structural characteristics. The local structure of a NiCoCr solid solution alloy is measured with x-ray or ...

    Abstract Multielement solid solution alloys are intrinsically disordered on the atomic scale, and many of their advanced properties originate from the local structural characteristics. The local structure of a NiCoCr solid solution alloy is measured with x-ray or neutron total scattering and extended x-ray absorption fine structure (EXAFS) techniques. The atomic pair distribution function analysis does not exhibit an observable structural distortion. However, an EXAFS analysis suggests that the Cr atoms are favorably bonded with Ni and Co in the solid solution alloys. This short-range order (SRO) may make an important contribution to the low values of the electrical and thermal conductivities of the Cr-alloyed solid solutions. In addition, an EXAFS analysis of Ni ion irradiated samples reveals that the degree of SRO in NiCoCr alloys is enhanced after irradiation.
    Language English
    Publishing date 2017-05-19
    Publishing country United States
    Document type Journal Article
    ZDB-ID 208853-8
    ISSN 1079-7114 ; 0031-9007
    ISSN (online) 1079-7114
    ISSN 0031-9007
    DOI 10.1103/PhysRevLett.118.205501
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  7. Article: Patterning SiC nanoprecipitate in Si single crystals by simultaneous dual- beam ion implantation

    Velişa, Gihan / Trocellier, Patrick / Thomé, Lionel / Vaubaillon, Sylvain / Sattonnay, Gaël / Miro, Sandrine / Serruys, Yves

    Journal of materials science. 2014 July, v. 49, no. 14

    2014  

    Abstract: β–SiC nanoprecipitates can be patterned in crystalline silicon with an almost monomodal size distribution by simultaneous-dual-beam of C⁺and Si⁺ion implantations at 550 °C. Their shape appears as spherical (average diameter ~4–5 nm) ,and they are in ... ...

    Abstract β–SiC nanoprecipitates can be patterned in crystalline silicon with an almost monomodal size distribution by simultaneous-dual-beam of C⁺and Si⁺ion implantations at 550 °C. Their shape appears as spherical (average diameter ~4–5 nm) ,and they are in epitaxial relationship with the crystalline silicon matrix. The narrow size distribution follows the left wing of the carbon distribution where the nuclear ion stopping, and thus the point defect generation rate is largest. This observation allows us to conclude that the induced damage act as sinks for C atoms leading to the SiC nanoprecipitates formation centered at the maximum of the simulated damage distribution. The nuclear reaction analysis, X-ray diffraction, Raman spectroscopy, and transmission electron microscopy techniques were used to characterize the samples.
    Keywords Raman spectroscopy ; X-ray diffraction ; carbon ; carbon sinks ; crystals ; silicon ; transmission electron microscopy
    Language English
    Dates of publication 2014-07
    Size p. 4899-4904.
    Publishing place Springer-Verlag
    Document type Article
    ZDB-ID 2015305-3
    ISSN 1573-4803 ; 0022-2461
    ISSN (online) 1573-4803
    ISSN 0022-2461
    DOI 10.1007/s10853-014-8191-6
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  8. Article ; Online: Effects of chemical alternation on damage accumulation in concentrated solid-solution alloys.

    Ullah, Mohammad W / Xue, Haizhou / Velisa, Gihan / Jin, Ke / Bei, Hongbin / Weber, William J / Zhang, Yanwen

    Scientific reports

    2017  Volume 7, Issue 1, Page(s) 4146

    Abstract: Single-phase concentrated solid-solution alloys (SP-CSAs) have recently gained unprecedented attention due to their promising properties. To understand effects of alloying elements on irradiation-induced defect production, recombination and evolution, an ...

    Abstract Single-phase concentrated solid-solution alloys (SP-CSAs) have recently gained unprecedented attention due to their promising properties. To understand effects of alloying elements on irradiation-induced defect production, recombination and evolution, an integrated study of ion irradiation, ion beam analysis and atomistic simulations are carried out on a unique set of model crystals with increasing chemical complexity, from pure Ni to Ni
    Language English
    Publishing date 2017-06-23
    Publishing country England
    Document type Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/s41598-017-04541-8
    Database MEDical Literature Analysis and Retrieval System OnLINE

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