Add time:08/10/2019         Source:sciencedirect.com

Cr3+ diffusion in chrysoberyl (BeAl2O4) irradiated by H+ ions and electrons has been studied and compared with diffusion in non-irradiated samples. Chrysoberyl crystals were irradiated with 6 MeV H+ ions to fluencies of 1×1016 cm–2 for 25 min and with 10 MeV electrons to fluencies of 2×1017 cm–2 for 1 h. Three different types of samples, which were doped with Cr3+, were annealed in horizontal alumina tube furnaces by 50 K intervals in the temperature range from 1773 to 1923 K for 200 h. Scanning electron microscope–energy dispersive X-ray spectrometer (SEM–EDX) was used to measure the diffusion. Arrhenius equations for the diffusion coefficient for Cr3+ in the temperature range 1773–1923 K were developed:Electron beam irradiated chrysoberyls,Dcr=2.1×10−5×exp (−482.3±18.2 kJ mol−1/RT)m2 s−1Proton beam irradiated chrysoberyls,Dcr=2.3×10−3×exp (−545.4±25.0 kJ mol−1/RT)m2 s−1Natural non-irradiated chrysoberylsDcr=2.2×10−3×exp (−547.9±36.8 kJ mol−1/RT)m2 s−1The results indicate that the chromium diffuses deepest into the electron beam irradiated chrysoberyls.

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