Piqueras De Noriega, Francisco JavierVila Santos, MaríaDíaz-Guerra Viejo, Carlos2023-06-202023-06-202012-03-150254-058410.1016/j.matchemphys.2012.01.088https://hdl.handle.net/20.500.14352/44026©2012 Elsevier B.V. This work has been supported by MICINN through projects MAT2009-07882 and CSD2009-0013 and by BSCH-UCM (Project GR35-10A-910146).Cathodoluminescence in the scanning electron microscope and photoluminescence in a confocal microscope have been used to investigate the luminescence properties of the stable monoclinic α-phase of Bi_2O_3. Powders of this oxide have been sintered at temperatures of 500 °C and 750 °C in air or in nitrogen atmospheres. Spectra of the starting powder and of the samples treated at 500 °C show luminescence bands at 1.50 eV and 1.95 eV as well as a band at 2.1 eV, more prominent in nitrogen treated samples. Sintering at 750 °C leads to quenching of the 1.50 eV infrared emission and the formation of a broad band with emission above 3 eV. The evolution of Raman bands with the sintering treatments has also been investigated.engjournal articlehttp://dx.doi.org/10.1016/j.matchemphys.2012.01.088http://www.sciencedirect.comrestricted access538.9Trioxide Thin-FilmsBismuth OxideOptical-PropertiesSpectraPhaseBi_2O_3BismuthsesquioxideEvaporationFísica de materiales