Carbon material Absorption Coefficient

CFDtoy

Hello

I am modeling fluid flow (mixture of hot gases) within a chamber covered with porous carbon material.

I am modeling radiative effects in the chamber due to the carbon material.

I got density of the porous carbon material and am in search of absorption coffiecient for carbon which is temperature dependent.

Can someone direct me to absorption coefficient models for high carbon materials (such as soot) to account for porous temperature dependent effects?

Thanks

CFDtoy