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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Garcia, J. A. ; Remon, A. ; Opagiste, C. | Elsevier Science BV | 1997-05The capability of luminescence techniques to characterize BaCuO_2 and in particular to detect the presence of this compound as impurity phase in high-T-c superconductors (HTSC) has been investigated. Cathodoluminescence (CL) in the scanning elec[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Opagiste, C. | Elsevier Science BV | 1996-03-01Luminescence properties of Tl_2Ba_2CuO_(6+ ?) samples with different superconducting transition temperatures have been studied by cathodoluminescence (CL) in the scanning electron microscope. Independent of the crystal structure, tetragonal or o[...]texto impreso
Superconducting Tl_2Ba_2Cu_1O(6+?) ceramics shows two broad luminescence bands centered at 430 nm (2.9 eV) and 530 nm (2.3 eV) wich can not be related to impurity phases. The intensity of the bands is inhomogeneously distributed in the sample an[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Tomashpolsky, Y. Y. ; Sadovskaya, N. V. ; Opagiste, C. | IOP publishing ltd | 1996-09Tl_2Ba-2CuO_(6+?) 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 ([...]texto impreso
Luminescence properties of tetragonal Tl_2Ba_2Cu_1O_(6+ ?) have been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM). The intensity of CL emission is inhomogeneous in the sample and its distribution has been fo[...]texto impreso
Tomashpolskii, Y. Y. ; Sadovskaya, N. V. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Opagiste, C. | Amer Inst Physics | 1997-03The structural changes and the cation and anion compositions of the surface of superconducting YBa_2Cu_3O_(7-x) and Tl_2Ba_2CuO_(6+x) ceramics after local irradiation for several seconds by an electron probe with an accelerating voltage of 25 kV[...]
