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Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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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
Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Dutta, P: S. ; Piqueras de Noriega, Javier ; Dieguez, E. | American Physical Society | 1998-03-15The luminescence properties of transition-metal (Cr, V, and Ru)-doped GaSb single crystals have been studied by a cathodoluminescence (CL) technique in a scanning electron microscope. Spatial segregation of impurities along the longitudinal dire[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 1995-09-01The effect of laser cutting on the structure of a chemical vapor deposited diamond film has been investigated by cathodoluminescence (CL) in the scanning electron microscope. The variation of particle morphology and CL spectra as a function of t[...]texto impreso
Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier ; Remon, A. ; Garcia, J. A. ; Santos, M. T. ; Dieguez, E. | American Institute of Physics | 1998-06-15Changes on the defect structure of Bi12GeO20 (BGO) and Bi12SiO20 (BSO) crystals induced by thermal treatments and laser irradiation have been studied by means of cathodoluminescence in the scanning electron microscope. The results have been comp[...]texto impreso
Díaz-Guerra Viejo, Carlos ; Pérez García, Lucas ; Piqueras de Noriega, Javier ; Chioncel, M. F. | American Institute of Physics | 2009-11-15Magnetic transitions in single-crystal alpha-F_2O_3 (hematite) nanowires, grown by thermal oxidation of iron powder, have been studied in the range of 5-1023 K with a superconducting quantum interference device below room temperature and with a [...]texto impreso
Maestre Varea, David ; Martínez Velasco, I. ; Cremades Rodríguez, Ana Isabel ; Amati, M. ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2010-07-15Mn-doped In(2)O(3) nanopyramids have been grown by a catalyst-free thermal process at 700 degrees C using InN and Mn(2)O(3) powders as precursors. Energy dispersive spectroscopy, as well as X-ray photoelectron spectroscopy, demonstrate the prese[...]texto impreso
Cebriano Ramírez, Teresa ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Elsevier Science SA | 2012-08-15Sb_2O_3 micro- and nanostructures of the face centered cubic phase, have been grown by a catalyst free evaporation deposition method with powder of metallic Sb as precursor. Nanopyramids, octahedra and nanorods are the building blocks of complex[...]texto impreso
Pereira, L. ; Pereira, E. ; Gomes, H. ; Rodrigues, A. ; Rees, A. ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Elsevier Science SA | 2000-04The properties of microelectrical conduction in microwave plasma assisted chemical vapour deposition (MPCVD) diamond films were investigated using an atomic force microscopy probe, giving a morphological map of the electrical conduction with a s[...]texto impreso
Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Physical Society | 1997-12-15We study, by cathodoluminescence and junction spectroscopy methods, the deep traps located near midgap in semiconducting and semi-insulating II-VI compounds, namely, undoped CdTe, CdTe:Cl, and Cd0.8Zn0.2Te. In order to understand the role such d[...]texto impreso
Alonso Orts, Manuel ; Nogales Díaz, Emilio ; San Juan, J. M. ; Nó, M. L. ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Amer Physical Soc | 2018-06-07Optical microcavities are key elements in many photonic devices, and those based on distributed Bragg reflectors (DBRs) enhance dramatically the end reflectivity, allowing for higher quality factors and finesse values. Besides, they allow for wi[...]texto impreso
Maestre Varea, David ; Haeussler, Dietrich ; Cremades Rodríguez, Ana Isabel ; Jaeger, Wolfgang ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2011-04In_2O_3 nanorods have been grown by a catalyst free evaporation-deposition method. Transmission electron microscopy (TEM) investigations reveal that the rods contain tubular cavities, herein referred to as "nanopipes", along the total length of [...]texto impreso
Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Vasco, E. ; Zaldo, C. | natl Inst Optoelectronics | 2004-03Scanning tunnelling microscopy and spectroscopy have been used to characterize electrically active grain boundaries in pulsed laser deposited ZnO films with grain sizes in the range 216-500 nm. The p-type behaviour at the boundary is evidenced b[...]texto impreso
Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Urbieta Quiroga, Ana Irene | Elsevier Science SA | 2012-02-15Mn doped ZnO nano- and microstructures have grown by a catalyst free evaporation-deposition method. Different morphologies such as nanowires, nanorods and stacks of nanoplates with a skewer arrangement around a central rod, have been obtained. S[...]texto impreso
Dutta, P. S. ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dieguez, E. ; Bhat, H. L. | Amer Inst Physics | 1996-07-15Diffusion of tellurium In undoped p-GaSb has been carried out. Using the cathodoluminescence and photoluminescence techniques, the luminescence centers in Te-diffused samples have been identified and compared with the Te-doped bulk GaSb. Fundame[...]texto impreso
The contactless modulation spectroscopy technique of photoreflectance (PR) has been used to study the near band edge transitions in CdTe, CdTe:V and CdTe:Ge bulk crystals in the range of 14 and 400 K for the first time. The lineshape of the PR[...]