Publication: Electron beam induced compositional and structural changes in Tl_2Ba_2CuO_(6+σ)
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1996-09
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IOP Publishing LTD
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Abstract
Tl_2Ba-2CuO_(6+σ) ceramics have been irradiated in a scanning electron microscope. The resultant changes in the cationic stoichiometry and oxygen content of the samples were investigated by cathodoluminescence (CL), secondary electron emission (SEE) and EDX microanalysis. ii depletion and Ba enrichment are observed in the irradiated areas. CL spectroscopy shows that irradiation causes the increase of a 540 nm emission band attributed to complex centres involving oxygen vacancies. Other features of the CL spectra strongly suggest the presence of radiation induced new phases. The SEE yield, Delta, has been found to depend on the oxygen content of the samples This dependence can be explained on the basis of two charge carrier subsystems and their mutual interaction, Measurements of ∆ allow us to detect an oxygen deficient region, sometimes extending up to a distance of about 1000 mu m, that surrounds the irradiated material.
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© 1996 IOP Publishing Ltd.
The authors thank S G Prutchenko for EDX measurements. CDG thanks the Spanish MEC for an FPI research grant. This work has been supported by DGICYT (project PB 93-1256), CICYT (project MAT 95-1184-E), NATO (grant HTECH. LG 941034), the Russian Foundation of Fundamental Research (project 94-03-0802) and the Russian State Programme on High Tc Superconductivity (project 93079).
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