Publication: Electron beam induced structural changes in bi_2Sr_2CaCu_2O_(8+x) studied by cathodoluminescence microscopy and secondary electron emission
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1997-04
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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.
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© 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).
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