Diffusion of chromium in sapphire: The effects of electron beam irradiation
- Title
- Diffusion of chromium in sapphire: The effects of electron beam irradiation
- Author
- 박종완
- Keywords
- Diffusion; Chromium; Sapphire; SEM-EDX
- Issue Date
- 2011-07
- Publisher
- ELSEVIER SCIENCE BV
- Citation
- Journal of Crystal Growth, 2011, 326(1), P.45-49
- Abstract
- In this paper, we measured the diffusion of chromium in sapphire (alpha-Al(2)O(3)). Sapphires were irradiated with 10 MeV electrons to fluencies of 2 x 10(17) cm(-2) for 1 h. Annealing experiments were performed using the three sapphire samples prepared using the three different diffusion methods at temperatures ranging from 1773 to 1923 K for 200 h under an oxidation condition of 1 atm. The diffusion of chromium in sapphire was profiled using scanning electron microscope-energy dispersive X-ray spectrometry (SEM-EDX). The following Arrhenius equations for the diffusion coefficient of Cr(3+) were obtained over the temperature range of 1773-1923 K:Coated and electron beam-irradiated sapphire samples,D(cr) = 1.8 x 10(-7) exp(-385.7 +/- 18.2 kJ mol(-1)/RT)m(2)s(-1);Electron beam-irradiated sapphire samples,D(cr) = 3.3 x 10(-7) exp(-401.0 +/- 14.7 kJ moL(-1)/RT)m(2)s(-1);Natural non-irradiated sapphires,D(cr) = 2.8 x 10(-7) exp(-405.9 +/- 28.7 kJ mol(-1)/RT)m(2)s(-1)These results indicate that chromium penetrated deepest within the coated and electron beam-irradiated sapphire samples.
- URI
- https://www.sciencedirect.com/science/article/pii/S0022024811000881https://repository.hanyang.ac.kr/handle/20.500.11754/72927
- ISSN
- 0022-0248
- DOI
- 10.1016/j.jcrysgro.2011.01.049
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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