The inter-diffusion of Li isotopes in separated 'Li and +'Li metals has been measured in the temperature range 35 to 178 "C. The results can be expressed as -12.634 + 0.139 and _ _ _ 7 0 , = (0.120 +o'022) -0.018 exp RT -12.848 k 0.222 + 0*03') exp ___ -0.030 RT where 7D6 denotes the diffusion of 6Li tracer in pure 7Li metal, and vice versa. The 7D6values exceed 6D7 by about 23% a t the melting point and by about 37% a t 0.7 T , (OK). A. LODDING, J. N. MUNDY, and A. OTT isotopreinen Li-Metallen hergeleitet : 7 0 , = (0,14 0,07) exp (Diffusionskoeffizienten in cm2/s, Energien in kcal/mol). -12,60 + 0.25 -12"' ' 0"8 RT und 6D6 = (0,14 + 0,08) exp --~-RT

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