Structure and Morphology of Cobalt-Doped Cubic–Rhombohedral In2O3

The influence of cobalt additives on the phase composition, structural parameters, and morphology of indium oxide containing a mixture of crystalline phases is studied. The hydrothermal synthesis method is used to obtain the corresponding systems. It is shown that during the hydrothermal reaction, a mixture of phases of indium hydroxide and oxyhydroxide is formed, which, in turn, after thermal decomposition, transform into cubic and rhombohedral indium oxide, respectively. Depending on the concentration of the introduced cobalt, the ratio between the phases changes. At a concentration of 0.05 at % Co, the cubic phase is prevalent, while at an introduction of 0.25 at %, the rhombohedral phase is prevalent compared to the undoped sample. An increase in the concentration of cobalt leads to a decrease in the particle size, as well as an increase in the specific surface area and porosity of the composites. At the same time, the introduction of cobalt does not significantly affect the morphology of the resulting systems.