analysis of selected samples (Mn 2 and Si 2) and identifies the
presence of all the expected elements. This also further
confirms the homogeneity of the phase formed. The compositions
derived from the micro-chemical analysis of the pigments
are in close agreement with the stoichiometry of the formulae.
The particle size distribution and histogram of the Mn 2 and
Si 2 pigments calcined at 1300 8C are illustrated in Fig. 4.
Particle size analysis of the typical pigments Mn 2 and Si 2
reveals a mean diameter of 5.86 mm (size of 90% particles
< 12.62 mm, 50% particles < 4.66 mm and 10% particles
< 1.16 mm) and 5.57 mm (size of 90%
particles < 10.08 mm, 50% particles < 5.08 mm and 10%
particles < 1.44 mm), respectively. The histograms show that