QC605 : Study of Physical Properties of Boron Carbide under Gamma Irradiation
Thesis > Central Library of Shahrood University > Physics > MSc > 2023
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Abstract
Boroncarbide with its unique composition is used in a wide range of engineering and industrial applications. Among these applications, we can mention the use in nuclear research. Rays and particles from radioactive sources can cause changes in the network structure and atoms of the mentioned material. In this research, Boroncarbide was subjected to gamma radiation from Cobalt 60 source in doses of 10, 50, 100, 150 and 200 kGy. In order to analyze the effect of irradiation, experiments such as X-ray diffraction, optical spectroscopy, Fourier transform infrared spectroscopy and field emission scanning electron microscope imaging have been conducted on boron carbide. In X-ray diffraction analysis, we can see the trend of reducing the height of the peaks, increasing the width of the peak at half of the maximum intensity (FWHM) and decreasing the crystallinity with the increase of the received dose to the material, although in the sample under 100 kGy irradiation, a turning point is reached which causes the increase of the peaks, decreasing FWHM and increasing in the decreasing process of crystallisation. In the investigation by optical spectroscopy, we see a sudden increase in reflection in the infrared region and a minimum band gap in the 100 kGy irradiated sample between the irradiated materials. In the analysis of the samples in the Fourier transform infrared spectroscopy, the sample exposed to radiation at a dose of 100 kGy has an optimal value of the resistance of carbon bonds and has the least restrictions compared to oxygen and hydrogen bonds. Imaging with a field emission scanning electron microscope in four magnifications of each sample. In this imaging, it was observed that in the irradiated sample of 100 kGy, crystal growth has taken place and there are larger clumps with more apparent coherence.
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#Keywords: boron carbide #irradiation #gamma ray #X-ray diffraction #spectrophotometry #Fourier transform infrared spectroscopy #field emission scanning electron microscope Keeping place: Central Library of Shahrood University
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