Díaz-Guerra Viejo, CarlosPiqueras De Noriega, Francisco JavierTomashpolsky, Y. Y.Sadovskaya, N. V.2023-06-202023-06-201997-040947-839610.1007/s003390050491https://hdl.handle.net/20.500.14352/59159© Springer-Verlag 1997. Authors thank S.G.Prutchenko for EDX measurements. This work has been supported by DGICYT (Project PB 93-1256), CICYT (ProjectMAT95-1184-E), NATO(Grant HTECH.LG941034), Russian Foundation of Fundamental Research (Project 94-03-0802) and Russian State Program on High-T Superconductivity (Project 93079).Bi_2Sr_2CaCu_2O_(8+x) superconducting ceramics have been irradiated in the scanning electron microscope (SEM), and the irradiation-induced effects investigated by cathodoluminescence (CL), secondary electron emission (SEE) and X-ray microanalysis. Electron beam irradiation causes a slight Bi depletion and an inhomogeneous Ca distribution. A higher CL intensity emission is found in the irradiated areas, where besides an enhancement of the oxygen content related 2.4 eV band, another CL bands probably related to new non-superconducting phases induced by irradiation can be observed. SEE yield measurements allow to detect an oxygen depleted region surrounding the irradiated areas. X-ray microanalysis shows that this intermediate region retains the cationic composition of the unaffected material. CL spectra from bright zones inside the same area also show a dominant 2.4 eV emission band, which supports its relation with oxygen deficiency or rearrangement in high-T-c superconductors.engjournal articlehttp://dx.doi.org/10.1007/s003390050491http://link.springer.comrestricted access538.9High-Tc SuperconductorsOxygen-ContentYBa_2cu_3O_(7-x)LuminescenceStoichiometryTemperatureSurfaceFilmsFísica de materiales