We consider two equations for the filling factor estimation of infiltrated
zinc oxide (ZnO) in silica (SiO_2) opal and gallium nitride in ZnO opal. The
first equation is based on the effective medium approximation, while the second
one - on Maxwell-Garnett approximation. The comparison between two filling
factors shows that both equations can be equally used for the estimation of the
quantity of infiltrated nanocrystals inside opal matrix.Comment: 14 pages, 7 figures, 1 table. Addendum to the article:
http://arxiv.org/abs/physics/050815