Showing 61 - 80 results of 8,836 for search '(( significant gap decrease ) OR ( significant ((spatial decrease) OR (small decrease)) ))', query time: 0.58s Refine Results
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    Partially Anion-Ordered Cerium Niobium Oxynitride Perovskite Phase with a Small Band Gap by Zonghao Shen (6008609)

    Published 2021
    “…Complex multistage redox processes of this material at elevated temperatures in air, including full amorphization above 200 °C, recrystallization at 650 °C, decomposition at 950 °C, and a final oxidation into the stoichiometric cerium niobium oxide CeNbO<sub>4</sub>, were observed by simultaneous thermal analysis and in situ X-ray powder diffraction. The band gap of the oxynitride material was investigated by UV–vis spectroscopy and, due to the incorporation of nitrogen into the oxygen sublattice, a significant decrease from <i>E</i><sub>g</sub> = 2.67 eV for the precursor oxide CeNbO<sub>4+δ</sub> to <i>E</i><sub>g</sub> = 1.79 eV was observed. …”
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