Subsolidus phase relations in the SnO2–CuSb2O6 binary system

The SnO2–CuSb2O6 binary system plays a significant role in the SnO2–Sb2O3–CuO ternary system, delimiting the compositional ranges and their sensor and catalytic properties. The initial compositions expressed as (1−x) SnO2–xCuSb2O6 were treated both non-isothermally using DTA up to 1500 °C and iso-thermally at temperatures between 1000 and 1200 °C. Phase analysis of the samples was determined by XRD and IR spectroscopy. It was established that SnO2–CuSb2O6 is a pseudobinary system with a solid solubility limit of the end members. The determined lattice parameters of the unit cell of the obtained rutile and trirutile solid solutions obeyed Vegardʹs rule. From IR spectral investigations it was inferred that Sn4+ might be preferentially incorporated on Sb5+ sites into the CuSb2O6 lattice.