Synthesis and structural characterisation of solid solutions Cr_x Ti_1-2x-yV_x+yO₂at atmospheric pressure

Abstract

Solid solutions Cr_x Ti_1-2x-y V_x+yO₂ (0<x<0·15; 0·08<y<0·10) with rutile structure have been synthesised by firing mixtures of Cr₂O₃ , V₂O₅ , and TiO₂ (anatase) in air at 800–1200°C and characterised by X-ray diffraction and electron microscopy. An excess of vanadium content over the chromium content was investigated to include V ₄₊ in the solid solutions. A decrease in the c lattice parameter with increase in the degree of substitution x and a constancy with temperature in the rutile unit cell parameters were observed in the 900–1200°C range. The thermal stability of these rutile solid solutions and the colouration of glazes containing 5 wt-% samples indicate their potential for use as ceramic pigments.