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Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Chioncel, M.F. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Vincent López, José Luis ; Bermudez, V. ; Dieguez, E. | IEEE | 2004The nature and the spatial distribution of radiative defects in In(X)Ga(1-x)Sb grown by the vertical Bridgman method have been studied by cathodoluminescence (CL) in a scanning electron microscope. The CL results have been complemented by X-ray [...]texto impreso
Sánchez, B ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Sirbu, L. ; Tiginyanu, I. ; M., I. ; Ursaki, V.V. | Springer Netherlands | 2008-01Porous GaP layers doped with erbium or europium elements have been obtained by electrochemical etching and further impregnation processes. The thermal treatments for optical activation of rare earth (RE) ions lead to partial oxidation of porous [...]texto impreso
Iribarren, A. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Academic Press Ltd- Elsevier Science Ltd | 2008-05ZnTe- and TeO_2-doped ZnO nanostructures and microstructures were obtained by a vapour-solid process by sintering compacted ZnO powder mixed with each precursor. Cathodoluminescence (CL) measurements show that if TeO_2 is used, then the defect b[...]texto impreso
Rams, J. ; Méndez Martín, Bianchi ; Craciun, G. ; Plugaru, R. ; Piqueras de Noriega, Javier | Amer Inst Physics | 1999-03-22An increase of the cathodoluminescence (CL) signal of porous silicon (PS) cracked in vacuum of up to three orders of magnitude has been achieved. Under high electron-beam currents, the samples cracked in interconnected pieces of tens of microns,[...]texto impreso
Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Amer Inst Physics | 2005-03-14ß-Ga_2O_3 nano- and microwires with diameters ranging from tens of nanometers to about one micron and lengths of up to tens of microns, have been obtained by sintering Ga_2O_3 powder under argon flow. The structures have been investigated by cat[...]texto impreso
Urchulutegui, M. ; Gómez, P. ; Piqueras de Noriega, Javier ; Dworschak, F. | Elsevier Science SA | 1994-05The effect of irradiation with 2.5 MeV electrons on InP single crystals is investigated by cathodoluminescence (CL) in the scanning electron microscope. Irradiation causes changes in the CL spectra but no luminescence band can be associated with[...]texto impreso
Hidalgo Alcalde, Pedro ; Plaza, J. L. ; Méndez Martín, Bianchi ; Dieguez, E. ; Piqueras de Noriega, Javier | Institute of Physics | 2002-12-16The luminescence of Te-doped GaSb crystals codoped with Er2O3 has been studied by means of cathodoluminescene (CL) using a scanning electron microscope. Doping with erbium oxide causes a substantial increase of the luminescence intensity of the [...]texto impreso
Plugaru, R. ; Craciun, G. ; Nastase, N. ; Méndez Martín, Bianchi ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Nogales Díaz, Emilio | Kluwer Academic Publishers | 2000-01Luminescence emission of LPCVD polycrystalline silicon films has been studied by cathodoluminescence (CL) in the scanning electron microscope. As-deposited films show visible luminescence with dominant blue band. The relative intensity of blue e[...]texto impreso
Cathodoluminescence of porous silicon after mechanical damage with a tip has been studied in the scanning electron microscope. Mechanical damage results in the exposure of new surfaces related to fracture and to small particles appearing over th[...]texto impreso
Piqueras de Noriega, Javier ; Méndez Martín, Bianchi ; Plugaru, R. ; Craciun, G. ; Garcia, J. A. ; Remon, A. | Springer | 1999-03Luminescence emission of nanocrystalline silicon films has been studied by cathodoluminescence (CL) in the scanning electron microscope. As-deposited films show a dominant band at 400 nm as well as a band centered at about 650 nm. CL spectra of [...]texto impreso
Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R ; Craciun, G. ; Nastase, N. ; Cremades Rodríguez, Ana Isabel ; Nogales Díaz, Emilio | Trans Tech-Scitec Publications LTD | 1998Luminescence emission of nanocrystalline silicon films has been studied by cathodoluminescence (CL) in the scanning electron microscope. As deposited films show visible luminescence with dominant blue band as well as a red band. The evolution of[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Montone, A. ; Piqueras de Noriega, Javier ; Cardellini, F. | Trans Tech Publications Ltd | 2000Mechanical milling is a technique extensively used to prepare nanocrystalline metallic materials but it has been less frequently applied to semiconductors. The preparation of nanocrystalline silicon by different methods is a subject of increasin[...]texto impreso
Aceves, R. ; Perez Sala, R. ; Barboza Flores, M. ; Pal, U ; Zaldivar, M.H. ; Piqueras de Noriega, Javier | Taylor & Francis Ltd | 2001Spectral cathodoluminescence of KCl:EU2+ (0.2% wt) crystals has been measured at different temperatures. In the 80-300 K temperature range the luminescence consists of three main broad emission bands with maxima around 418, 452, and 619nm. Based[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Mitric, A. ; Piqueras de Noriega, Javier ; Duffar, T. | Academic Press Ltd- Elsevier Science Ltd | 2009-04Cathodoluminescence (CL) in the scanning electron microscope and wavelength dispersive X-ray microanalysis (WDX) have been used to assess the homogeneity of a whole Te-doped In_xGa_(1-x)Sb ingot grown by the vertical Bridgman method under an alt[...]texto impreso
Pal, U. ; Piqueras de Noriega, Javier ; Serrano, M. D. ; Sochinskii, N. V. | Springer Verlag | 1995-12CathodoLuminescence studies (CL) have been carried out on red mercuric-iodide (?-HgI_2) crystals and platelets grown by the vapor transport method. Panchromatic CL images revealed inhomogeneous distribution of growth-induced dislocations and ter[...]texto impreso
Fernández Sánchez, Paloma ; Garcia, J. A. ; Remon, A ; Piqueras de Noriega, Javier ; Muñoz, V. ; Triboulet, R. | IOP publishing ltd | 1998-04ZnTe single crystals grown by the cold travelling heater method have been investigated by means of photo-and cathodoluminescence. The spectral region covered in this work ranges from 2.48 eV (500 nm) which corresponds to band-edge emission to 0.[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Tomashpolsky, Y. Y. ; Sadovskaya, N. V. | Akademie Verlag GMBH | 1996-06-16Cathodoluminescence (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 pol[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Volciuc, O. ; Popa, V. ; Tiginyanu, I. M. | American Institute of Physics | 2006-07-15Cathodoluminescence (CL) microscopy and spectroscopy have been used to investigate the optical properties of GaN microstructures patterned by Ar+ ion irradiation and subsequent photoelectrochemical (PEC) etching. Monochromatic CL images and CL s[...]texto impreso
Cathodoluminescence (CL) microscopy and spectroscopy have been used to investigate the nature and spatial distribution of defects and impurities in n-type epitaxial 4H-SiC. CL microscopy reveals the existence of 6H-SiC polytype inclusions, while[...]texto impreso
Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier ; Sirbu, L. ; Tiginyanu, M. | IOP publishing ltd | 2005-12The luminescence of porous InP prepared by electrochemical etching is investigated by cathodoluminescence (CL) in a scanning electron microscope (SEM). Anodization causes a strong reduction of CL intensity as well as a blue spectral shift. Addit[...]texto impreso
Cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope have been applied to the microcharacterization of superconducting Bi2Sr2CaCu2O8+x single crystals. CL spectra representative of the samples at macroscopic l[...]texto impreso
Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P. S. ; Dieguez, E. | Elsevier Science SA | 1996-12-15We present the homogeneity and luminescence properties of bulk GaSb obtained by the cathodoluminescence (CL) technique in the scanning electron microscope. The samples used in this study are as-grown undoped and impurity diffused (tellurium) and[...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Hardalov, C. ; Sekiguchi, T. | IOP publishing ltd | 2001-10-07Bulk ZnO single crystals grown by the hydrothermal and flux methods have been characterized by steady-state and time resolved cathodoluminescence measurements performed on the different crystalline faces. A shift of the peak near band edge towar[...]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
Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2004-03Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the luminescence mechanisms in tin oxide. Sintered material prepared from high purity powder has been found to show a strong dependence of the CL emi[...]