Effects of electron-beam irradiation,a thin-Ti layer,and a BeO additive on the diffusion of titanium in synthetic sapphire |
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Authors: | Yongkil Ahn Jingyo Seo Pornsawat Wathanakul Jongwan Park |
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Affiliation: | 1. Department of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Republic of Korea;2. Department of Earth Sciences, Faculty of Science, Kasetsart University, Bangkok 10900, Thailand;3. The Gem and Jewelry Institute of Thailand (Public Organization), Bangkok 10500, Thailand |
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Abstract: | Titanium was allowed to diffuse into synthetic sapphire (α-Al2O3) at 1773–1923 K for 200 h in air. Specimens were prepared by four different methods. Samples were irradiated with a 10 MeV electron beam to fluencies of 2×1017 cm−2 for 1 h to induce vacancy formation. A 1-μm layer of titanium was sputtered onto sapphire samples to provide intimate contact with the diffusing elements. Ti diffusion was performed using TiO2 powder or a mixture of TiO2 and BeO powders in a ratio of 95:5 to take advantage of the beryllium activity. Ti diffusion was profiled using scanning electron microscope-energy dispersive X-ray spectrometry (SEM–EDX). The diffusion coefficients of Ti were as follows: |
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Keywords: | C Diffusion D Al2O3 D TiO2 Electron beam irradiation |
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