Thermal transformation of cubic-shaped MSn(OH)₆ (M = Ca, Mn, Co, and Zn) hydroxides to SnO₂–MO_x mixed oxides

抄録

The tin–metal mixed hydroxides CaSn(OH)₆, MnSn(OH)₆, CoSn(OH)₆, and ZnSn(OH)₆, with cubic morphologies, were prepared using a coprecipitation method; they were subsequently transformed into the corresponding tin–metal mixed oxides by calcination at 600–900 °C. The crystalline structures and the morphologies of the various samples at each calcination step (just prepared, dried at 110 °C, and calcined at 600 and 900 °C) were systematically evaluated by X-ray diffractometry, scanning electron microscopy, transmission electron microscopy, and X-ray absorption fine structure analyses. The cubic shapes of the CaSn(OH)₆ and ZnSn(OH)₆ nanoparticles were maintained after calcination of them at 600 and 900 °C, while those of MnSn(OH)₆ and CoSn(OH)₆ ones were not maintained after calcination of them.