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The effects of fast neutron irradiation on oxygen in Czochralski silicon

Chinese Physics B 2009年第1期18卷 293-297页

作者：陈贵锋阎文博陈洪建李兴华李养贤 School of Material Science and Engineering Hebei University of Technology

The effects of fast neutron irradiation on oxygen atoms in Czochralski silicon （CZ-Si） are investigated systemically by using Fourier transform infrared （ftir） spectrometer and positron annihilation technique （PAT）. Through isochronal annealing, it is found that the trend of variation in interstitial oxygen concentration （[Oi]） in fast neutrons irradiated CZ-Si fluctuates largely with temperature increasing, especially between 500 and 700℃. After the CZ-Si is annealed at 600℃, the V4 appearing as three-dimensional vacancy clusters causes the formation of the molecule-like oxygen clusters, and more importantly these dimers with small binding energies （0.1-1.0eV） can diffuse into the Si lattices more easily than single oxygen atoms, thereby leading to the strong oxygen agglomerations. When the CZ-Si is annealed at temperature increasing up to 700℃, three-dimensional vacancy clusters disappear and the oxygen agglomerations decompose into single oxygen atoms （O） at interstitial sites. Results from ftir spectrometer and PAT provide an insight into the nature of the [Oi] at temperatures between 500 and 700℃. It turns out that the large fluctuation of [Oi] after short-time annealing from 500 to 700℃ results from the transformation of fast neutron irradiation defects.

关键词： neutron irradiation irradiation defects ftir spectrometer positron lifetime

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Growth and Simulation Study of Glycine Sodium Nitrate Non-Linear Single Crystal

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Advances in Materials Physics and Chemistry 2021年第1期11卷 20-30页

作者： Wafa S. Abdelrahman Abdelrazig M. Abdelbagi Abbaker A. Abdalla Mubarak E. Ahmed Department of Physics College of Science and Arts AL-Muthnib Qassim University Buraydah KSA College of Science and Humanities Dawadami Shaqra University Shaqra KSA Faculty of Science Omdurman Islamic University Omdurman Sudan College of Science Qassim University Buraydah KSA Faculty of Science University of Khartoum Khartoum Sudan

The present study is designed to simulate and study the production of single crystals of semi-organic non-linear optical Glycine Sodium Nitrate (GSN) by using hyper6 software and experimentally by slow evaporation technique. This work has investigated the molecular properties of the crystals using the density functional theory to obtain the infrared spectrum of the crystal by simulation. The ftir investigation of growing crystal has shown that the spectrum of the GSN crystal compared to simulation evaluation is similar;the only difference is in the range of 1.9% to 2.75% of wavelength peak values. The ultraviolet experimental measurement of the GSN molecule reveals the possibility of non-linear properties due to the spectrum cutoff in the wavelength peak of 301 nm. There was a significantly positive correlation between simulation and experimental assessment.

关键词： Glycine Sodium Nitrate Simulation Crystal Growth ftir spectrometer UV-Spectrophotometer

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