Thermal Conductivity Conversion

[chemeguy]

Is there a way to convert thermal conductivity to the diffusion coefficient? Or is there a way to use the thermal conductivity in Fick's Law?

 

[Integral]

http://en.wikipedia.org/wiki/Thermal_diffusivity" puts it best.

 

[chemeguy]

Thank you sooooooooooooooooooooooo much :)