Doping SrSnO3 perovskite with transition metals: Synthesis of double hydroxides, thermal decomposition, and pigment potential

The primary objective of this research is to explore the feasibility of synthesizing phase-pure perovskite SrSnO₃ doped with transition metals and to evaluate the potential of these products as high-temperature inorganic pigments. The initial step in preparing perovskite powders with the general formula SrSn_0.95M_0.05O_3-δ (M = Mn, Fe, Co, Ni) involved synthesizing SrSn_0.95M_0.05(OH)₆ followed by its thermal decomposition. The thermal decomposition processes and the reaction pathway for perovskite formation were analyzed using thermal analysis and X-ray diffraction analysis. Single-phase products of beige SrSn_0.95Fe_0.05O_3-δ and brown SrSn_0.95Co_0.05O_3-δ were successfully obtained by calcining the precursors at 1,100 °C. In contrast, brown SrSn_0.95Mn_0.05O_3-δ contained a phase impurity of SnO₂ and doping with Ni ions resulted in a phase mixture of SrSnO₃ and NiO. The pigment quality of the powders was assessed based on their color parameters, described using the CIE Lab system.