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The concentration profile of N i 2 S i O 4 diffusing into M g 2 S i O 4 is given below [ M

The concentration profile of

N i_{2} S i O_{4}

diffusing into

M g_{2} S i O_{4}

is given below

[

.

Morioka, Geochim Cosmochim Acta,

45, 1573 (1981)] .

These data were found after

20 h r s

using an infinite couple at

1, 350 C .

Calculate the diffusion coefficient in this system. Answer:

1.2 * 10^{- 11} c \frac{m^{2}}{s e c} .

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