Respuesta :
In-situ observation and analysis of solid-state diffusion and liquid migration in a crystal growth system: A segregation-driven diffusion couple.
What is segregation driven by diffusion?
In a straightforward experiment carried out prior to the crystal formation of the scintillator BaBrCl:5%Eu using a vertical gradient freeze approach, energy-resolved neutron imaging is used for in-situ measurements of dopant transport. We observed the diffusion of Eu from the solid phase into the melt over a period of about 4 hours during the stabilization phase prior to development.
We calculate the solid-state diffusivity of Eu in BaBrCl as D1=1.91010 m2/s and an upper limit for the liquid-phase diffusivity of Eu in the melt as D2*=2.51010 m2/s, both at temperatures close to the melting point. We do this by comparing the measured centerline concentration profile with a mathematical model for the system. We contrast this experiment with the traditional diffusion couple method in which a concentration discontinuity brought on by segregation drives diffusion.
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