Brown pigments with perovskite structure of SrSnO3: The role of mineralizers

Ceramic pigments of the type SrSn0.8Mn0.2O3 were prepared by classical method. Solidstate reaction of initial components was supported by molten salts that had played role of mineralizers. The selected mineralizers (Li2CO3, NaF:NaCl (1:1), KCl, KCl:K2CO3 (1:1), and Na3AlF6) in an amount of 5 % (w/w) were used. Effect of the type of mineralizer and the calcining temperature on the colour properties, particle size distribution, morphological properties and phase composition was studied. The singlephase product was obtained at calcining temperature of 1200°C and above. A particle size of d50 was varied in the range 1.1–6.5 μm. The pigments prepared were applied into the organic matrix. With a higher calcining temperature, the brown colour of application became darker. The most interesting brown colour of pigment was eventually obtained by calcination of the reaction mixture containing the NaF:NaCl mixture