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Panthera Leo

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**Isn't my calculation of diffusion coefficient correct?**

A certain silicate is diffused at 750 centigrade... The diffused ion had an ingression depth squared of 2.5x10^-5 cm^2 after 7 days of contineous heating.

What is the diffusion coefficient of this ion in this particular silicate?

Isn't this the correct method of calculating diffusion coefficient at some temp:

x=sqrt(Dt)

so; 2.5x10^-5 = D (7x24x3600)

__D = 4.3x10^-11 cm^2/sec__

the calculated value in my textbook is 2x10^-12 cm^2/sec ! is it a typo? or I am wrong :)

Many thanks in advance