Temperature-Induced Phase Transition of In2O3 from a Rhombohedral Structure to a Body-Centered Cubic Structure

We report an experimental study on the temperature-induced phase transition of three-dimensional nanosheet-based flower-like microspheres(NBFMs)of In2O3.Using InOOH as precursor,rhombohedral−In2O3 NBFMs are fabricated.Temperature−induced phase transition of In2O3 NBFMs from a rhombohedral(rh)structure to a body−centered cubic(bcc)structure is examined by Raman spectroscopy and x-ray diffraction.The critical phase transition temperature is found to be about 500°C.Photoluminescence(PL)spectra of In2O3 are measured before annealing and after annealing at different temperatures.The PL spectral results provide further evidence for the phase transition,confirming the fabrication of bcc−In2O3 NBFMs via a simple annealing method.