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${it In-situ}$ observation and analysis of solid-state diffusion and liquid migration in a crystal growth system; A Segregation-driven diffusion couple

Tremsin, A. S.*; Perrodin, D.*; Losko, A. S.*; Vogel, S. C.*; Shinohara, Takenao   ; Oikawa, Kenichi   ; Bizarri, G. A.*; Bourret, E. D.*; Peterson, J. H.*; Wang, K. P.*; Derby, J. J.*

Energy-resolved neutron imaging is employed for ${it in situ}$ measurements of dopant transport in a simple experiment performed before the crystal growth of the scintillator BaBrCl:5%Eu via a vertical gradient freeze technique. During a stabilization period preceding growth, we observed the diffusion of Eu from the solid phase into the melt over a period of approximately 4 h. Comparing the measured centerline concentration profile with a mathematical model for the system, we estimate the solid-state diffusivity of Eu in BaBrCl as $$D$$$$_{1}$$ = 1.9 $$times$$ 10$$^{-10}$$ m$$^{2}$$/s and an upper limit for the liquid-phase diffusivity of Eu in the melt as $$D$$$$_2^{*}$$ = 2.5 $$times$$ 10$$^{-10}$$ m$$^{2}$$/s, at temperatures near the melting point. We compare this experiment, where diffusion is driven by a concentration discontinuity arising from segregation, to the classical diffusion couple technique.

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Category:Materials Science, Multidisciplinary

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