"We may estimate the critical homologous temperature for fcc metals using the relation X^2=4D(tau) where X=0.1 nm, D=10^-7*exp(-6.5T*/T m^2/s, where T* is the melting point temperature in ( [sic] degrees Kelvin) and T the actual temperature, while tau the time period will be taken to equal about 3600s for grain boundary migration and to N0(omega)/R
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