Papers by Keyword: Irradiation

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Authors: Alexander A. Lebedev, S.V. Belov, Marina G. Mynbaeva, Anatoly M. Strel'chuk, Elena V. Bogdanova, Yu.N. Makarov, A.S. Usikov, Sergey Kurin, I.S. Barash, Alexander D. Roenkov, Vitalii V. Kozlovski
Abstract: Schottky-barrier diodes with a diameter of ~10 μm are fabricated on n-GaN epitaxial films grown by hydride vapor-phase epitaxy (HVPE) on sapphire substrates. The changes in the parameters of the diodes under irradiation with 15 MeV protons are studied. The carrier rate was found to be 130-145 cm-1. The linear nature of the dependence N = F (D) (N is carrier concentration, and D, the irradiation dose) shows that compensation of the material is associated with transition of electrons from shallow donors to deep acceptor levels which are related to primary radiation defects.
Authors: B. Berenguier, Laurent Ottaviani, Stéphane Biondo, Mihai Lazar, Frédéric Milesi, Olivier Palais, Frank Torregrosa, A. Lyoussi, Evgenia Kalinina, A. Lebedev
Abstract: Spectral sensitivity measurements versus temperature have been carried out on irradiated SiC p+n photodiodes, fabricated using two different doping processes: Aluminium standard implantation and Boron plasma immersion ion implantation. The spectral sensitivity of Al doped photodiodes increase for incident wavelength higher than 270 nm, and are very stable below. Boron doped irradiated photodiodes show a general increase of the photoresponse for all wavelengths. In both cases, an hysteresis effect is observable when with the temperature. Results are presented and discussed.
Authors: Marie Helene Mathon, Yann de Carlan, Sheng Yi Zhong, Jean Henry, Patrick Olier, Vincent Klosek, Vincent Ji
Abstract: Small Angle Neutron Scattering (SANS) technique allows to characterize at a nanoscale the microstructure of the ferritic martensitic steels and ODS FeCr alloys which are candidates for the internal structures of future nuclear reactors. Firstly, the microstructure evolution induced by neutron irradiation at high dose in conventional and Reduced Activation Fe9%Cr martensitic steels is presented. Then, a SANS study of Oxide Dispersion Strengthened (ODS) alloys is also presented. The main objective is to control the nano-size oxide particles at the various stages of the fabrication process.
Authors: Yves Limoge, Alain Barbu
Abstract: In this conference we try to give a survey of the main characteristics of aging of oxides under irradiation in the perspective of the recent developments of the ab-initio modeling capabilities. After a brief recall of the relevant radiation – matter interactions, we present the main aspects of materials aging under irradiation, I) defect creation either elastically or inelastically, ii) microstructure evolution due to defect elimination, iii) radiation enhanced diffusion, iv) phase changes under irradiation.
Authors: Walter M. Klahold, Robert P. Devaty, Wolfgang J. Choyke, Koutarou Kawahara, Tsunenobu Kimoto, Takeshi Ohshima
Abstract: Ultra-pure n-type (8×1013 cm-3), 99 μm thick epitaxial films of 4H SiC were electron irradiated at 170 keV with a fluence of 5×1016 cm-2 or at 1 MeV with a fluence of 1×1015 cm-2 in various geometries. Low temperature photoluminescence (LTPL) spectra and microwave photoconductance (μPCD) lifetime measurements were obtained on all samples prior to annealing and after annealing in Argon in free standing mode or on a POCO carbon platform, every 50°C from 1100°C to 1500°C. No improvement in carrier lifetime was obtained. Spurious lines attributable to the use of a Genesis CX 3550Å laser are also reported.
Authors: Tie Zhang, Dong Bin Zhu, Chun Guang Wang, Xin He
Abstract: An Ag-Ce-TiO2 composite film was prepared by incorporating Ag in the Ce-TiO2 films with an impregnation method through photoreduction. The bactericidal activity of the Ag-Ce-TiO2 composite film and the effect of deposition of silver and doping cerium in the different irradiations on the antibacterial performance were assessed against Escherichia coli (E. coli). TIhrough characterization of X-ray diffraction (XRD), X-ray photoelectronic spectra (XPS) and UV/VIS diffusive reflectance spectra (DRS), it was found that the Ag-Ce-TiO2 composite film was composed of predominant anatase titania, cerium oxides (in the form of Ce2O3/CeO2) and silver nanoparticles. Moreover, the bactericidal activity of the Ag-Ce-TiO2 composite film and the effect of deposition of silver and doping cerium in the different irradiations on the antibacterial performance were assessed against Escherichia coli (E. coli). The results show that the Ag-Ce-TiO2 composite film has much higher antibacterial efficiency than that of glass and pure TiO2 film either in the room light or in the dark. Therefore, this composite film is promising in applications of antimicrobial and self-clean technologies.
Authors: Björn Magnusson, Alexsandre Ellison, F.H.C. Carlsson, Nguyen Tien Son, Erik Janzén
Authors: K. Kobayashi, H. Ohyama, K. Hayama, Y. Takami, Eddy Simoen, A. Poyai, Cor Claeys, A. Mohammadzadeh, S. Kohiki
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