Solid state solubility between SnO2 and (FeSb)O4at high temperature

Abstract

The solubility in the solid state was investigated for the pseudo-binary system SnO2—(FeSb)O4 at high temperature. Stoichiometric amounts of pure SnO2 and (FeSb)O4 powders 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 (Sn 2x Fe 1–x Sb 1–x )O4 solid 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.