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Cathodoluminescence microscopy and secondary electron emission in mechanically polished and electron irradiated YBa_2Cu_3O_(7-x) ceramics

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Díaz-Guerra Viejo, Carlos and Piqueras de Noriega, Javier and Tomashpolsky, Y. Y. and Sadovskaya, N. V. (1996) Cathodoluminescence microscopy and secondary electron emission in mechanically polished and electron irradiated YBa_2Cu_3O_(7-x) ceramics. Physica Status Solidi A-Applied Research, 155 (2). pp. 525-539. ISSN 0031-8965

Official URL: http://dx.doi.org/10.1002/pssa.2211550227




Abstract

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.


Item Type:Article
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© 1996 WILEY-VCH Verlag GmbH & Co. KGaA

Uncontrolled Keywords:Laser Ablation, Thin-Films, Superconductors, Luminescence, Surface
Subjects:Sciences > Physics > Materials
ID Code:26763
Deposited On:30 Sep 2014 17:49
Last Modified:30 Sep 2014 17:49

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