Samples were synthesised by solid-state reaction at high temperatures and characterised by X-ray diffraction analysis, colouristic analysis and particle size analysis. Possible MoO evaporation at high temperatures was studied by method of thermal analysis. The most interesting sample is SrO-0.65SnO-0.05MoO-0.075TbO which was prepared by calcination at 1500 °C. This powder is single phase, with cubic structure. Colour of the sample is dark green ( L* = 46.37, b* = −9.630 and b* = 10.60).