2026-06-27T23:23:05Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/592112024-09-06T18:27:53Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Díaz-Guerra Viejo, Carlos
author
Piqueras De Noriega, Francisco Javier
author
Tomashpolsky, Y. Y.
author
Sadovskaya, N. V.
2023-06-20T19:04:34Z
2023-06-20T19:04:34Z
1996-06-16
0031-8965
10.1002/pssa.2211550227
https://hdl.handle.net/20.500.14352/59211
http://dx.doi.org/10.1002/pssa.2211550227
http://onlinelibrary.wiley.com/
Cathodoluminescence (CL) and secondary electron emission (SEE) in the scanning electron microscope have been used to study the effects of mechanical polishing and electron irradiation on YBa2Cu3O7-x ceramics. CL spectra from the mechanically polished superconductors show an enhanced 2.4 eV luminescence band, which is related to oxygen content redistribution or depletion. Electron irradiation induces strong morphological and compositional changes which are proposed to be connected with melting-resolidification processes and surface phase segregation. SEE yield measurements allow to detect an oxygen depleted area with stoichiometric cationic composition surrounding the irradiated region. CL spectra recorded from this oxygen-deficient area also show an enhanced 2.3 to 2.4 eV emission band in comparison with the spectra recorded from the non-irradiated material. Strongly luminescent non-superconducting phases appear in the irradiated regions, showing intense 3.1 and 0.78 to 0.81 eV emission bands.
Cathodoluminescence microscopy and secondary electron emission in mechanically polished and electron irradiated YBa_2Cu_3O_(7-x) ceramics
journal article