Journal ArticleDOI
Ion beam induced amorphization in α quartz
F. Harbsmeier,W. Bolse +1 more
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In this article, the amorphization of α quartz induced by light and medium mass ion bombardment has been investigated by means of Rutherford backscattering spectrometry in channeling geometry, resonant nuclear reaction analysis and mechanical surface profiling.Abstract:
The amorphization of α quartz induced by light and medium mass ion bombardment has been investigated by means of Rutherford backscattering spectrometry in channeling geometry, resonant nuclear reaction analysis and mechanical surface profiling. The single crystalline samples were irradiated at 77 K with H+, N+, Ne+ and Na+ ions at energies of 10–100 keV and fluences up to 5×1016 ions/cm2. Disordering of α quartz by ion bombardment was found to occur by three-dimensional nucleation and growth of defect agglomerates and, possibly, small, spatially separated amorphous zones in the still crystalline surrounding. The nucleation rate scales with the energy density FD in elastic collisions. Above a critical energy density EC=1.92(7)eV/at deposited by nuclear collisions (corresponding to a displacement rate of 0.04 dpa) a coherent amorphous layer forms at the depth of maximum energy deposition, which then grows towards the surface and into larger depths during continued ion bombardment. Mechanical surface profili...read more
Citations
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Amorphization and recrystallization of covalent tetrahedral networks
TL;DR: In this paper, a review of recent studies on the amorphization and recrystallization of light covalent ceramics SiC, Si3N4 and SiO2 is presented.
Journal ArticleDOI
Radiation effects in concrete for nuclear power plants, Part II: Perspective from micromechanical modeling
TL;DR: In this article, a micromechanical approach based on the Hashin composite sphere model is presented to derive a first-order separation of the effects of radiation on cement paste and aggregate, and, also, on their interaction.
Journal ArticleDOI
Possibility of radiation-induced degradation of concrete by alkali-silica reaction of aggregates
Tsuneki Ichikawa,Hitoshi Koizumi +1 more
TL;DR: In this paper, the effect of Ar ion irradiation on the reactivity of crystalline and amorphous quartz to alkali has been examined for clarifying whether radiation from nuclear reactors accelerates the degradation of concrete by inducing alkali-silica reaction of aggregates.
Journal ArticleDOI
Development of Soundness Assessment Procedure for Concrete Members Affected by Neutron and Gamma-Ray Irradiation
Ippei Maruyama,Osamu Kontani,Masayuki Takizawa,Shohei Sawada,Shunsuke Ishikawao,Junichi Yasukouchi,Osamu Sato,Junji Etoh,Takafumi Igari +8 more
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Review of the Current State of Knowledge on the Effects of Radiation on Concrete
Thomas M. Rosseel,Ippei Maruyama,Yann Le Pape,Osamu Kontani,Alain B. Giorla,Igor Remec,James J. Wall,Madhumita Sircar,Carmen Andrade,Manuel Ordoñez +9 more
TL;DR: A review of the current state of knowledge on the effects of radiation on concrete in nuclear applications is presented in this paper, where the authors focus on changes in engineering properties of concrete in the evaluation of the long-term operation (LTO) and for Plant Life or Aging Management of nuclear power plants (NPPs) in Japan, Spain, and United States.
References
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Kinetics of Phase Change. I General Theory
TL;DR: In this paper, the theory of phase change is developed with the experimentally supported assumptions that the new phase is nucleated by germ nuclei which already exist in the old phase, and whose number can be altered by previous treatment.
Journal ArticleDOI
Kinetics of Phase Change. II Transformation‐Time Relations for Random Distribution of Nuclei
TL;DR: In this article, a relation between the actual transformed volume V and a related extended volume V1 ex is derived upon statistical considerations, and a rough approximation to this relation is shown to lead, under the proper conditions, to the empirical formula of Austin and Rickett.
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Granulation, Phase Change, and Microstructure Kinetics of Phase Change. III
TL;DR: In this paper, a comprehensive description of the phenomena of phase change may be summarized in Phase Change, Grain Number and Microstructure Formulas or Diagrams, giving, respectively, the transformed volume, grain, and microstructure densities as a function of time, temperature, and other variables.
Journal ArticleDOI
The Tension of Metallic Films Deposited by Electrolysis
TL;DR: It is well known that metallic films deposited electrolytically are in many cases liable to peel off if deposited to any considerable thickness as discussed by the authors, especially if it does not adhere very tightly to the body on which it is deposited.
Book
Handbook of modern ion beam materials analysis
Joseph R. Tesmer,Michael Nastasi +1 more
TL;DR: The Handbook of Modern Ion Beam Materials Analysis, Second Edition is a compilation of updated techniques and data for use in the ion-beam analysis of materials, written and compiled by over 30 leading authorities in the field of ion beam analysis.