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...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.展开更多
We report here the acoustic local mode and TA band mode for the lattice vibration of the mixed crystals Cd_(1-x)Mn_(x)Te as observed by very far infrared spectra.The occurence of the acoustic local mode and the weakly...We report here the acoustic local mode and TA band mode for the lattice vibration of the mixed crystals Cd_(1-x)Mn_(x)Te as observed by very far infrared spectra.The occurence of the acoustic local mode and the weakly optical activity of TA mode induced by crystalline-mixing are discussed in light of the defect lattice dynamics.展开更多
基金by the National Natural Science Foundation of Chinathe Ministry of Science and Technology of China(2011CB925602,2010DAF0260).
文摘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.
文摘We report here the acoustic local mode and TA band mode for the lattice vibration of the mixed crystals Cd_(1-x)Mn_(x)Te as observed by very far infrared spectra.The occurence of the acoustic local mode and the weakly optical activity of TA mode induced by crystalline-mixing are discussed in light of the defect lattice dynamics.
