Solid state solubility between SnO2and (FeSb)O4at high temperature

The solubility in the solid state was investigated for the pseudo-binary system SnO2—(FeSb)O4at high temperature. Stoichiometric amounts of pure SnO2and (FeSb)O4powders were mixed and reacted in air at 1373 K. Solid state solubility was ascertained in the whole compositional range at high temperature, whereas at low temperature a miscibility gap occurs. The structural refinement performed according to the Rietveld method reveals that the (Sn2xFe1–xSb1–x)O4solid solution (0 ≤ x≤ 1) crystallizes in the tetragonal system with a rutile-type structure. Negative deviations from Vegard's law were observed. An anisotropic broadening of the X-ray reflections was observed and analysed by means of Williamson-Hall plots.