Información del autor
Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Rodríguez Fernández, J. ; Carcelen, V. ; Hidalgo Alcalde, Pedro ; Vijayan, N. ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Pérez, J. M. ; Dieguez, E. | Amer Inst Physics | 2009-08-15Cadmium zinc telluride, CdZnTe, bulk single crystals doped with 10^19 at./cm^3 of indium in the initial melt were grown by vertical Bridgman technique. The samples were investigated by energy dispersive spectroscopy, cathodoluminiscence (CL), an[...]![]()
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Remote electron beam induced current (REBIC) measurements have been carried out to investigate electrically active regions in YBa_2Cu_3O_(7-x) single crystals. Enhanced REBIC contrast, found in growth steps and other topographic features of the [...]![]()
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García, J.A. ; Plugaru, R ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Tate, T. J. | Cambridge Univ Press | 2004-07The luminescence of amorphous silicon layers either implanted with Er or co-implanted with Er and O has been studied by photoluminescence (PL) and cathodoluminescence (CL) in the scanning electron microscope. Annealing in nitrogen causes the for[...]![]()
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Cebriano Ramírez, Teresa ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Springer | 2013-05Sb_2O_3 microrods of the orthorhombic phase have been grown by evaporation deposition with Sb powder as precursor. The rods, of rectangular cross section, are composed of weakly bonded stacks of tiny plates of few hundreds of nanometres, which s[...]![]()
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Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier | American Institute of Physics | 1989-09-15Polycrystalline GaP and InP have been observed by scanning electron acoustic microscopy. While grain boundaries show a weak contrast, twinned regions are clearly revealed. Results suggest that the contrast observed is related to signal generatio[...]![]()
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Domínguez-Adame Acosta, Francisco ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Pergamon-Elsevier Science Ltd | 1993-09The temperature dependence of scanning electron acoustic microscopy (SEAM) and cathodoluminescence signals of B_i2Sr_2CaCu_2O_x samples have been measured. The evolution of SEAM signal with temperature between 90 and 300 K indicates the capabili[...]![]()
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Some scanning electron acoustic microscopy (SEAM) applications to the characterization of electronic materials are discussed. The specific problem of the observation of dislocations and dislocation-related features in GaAs is treated as an examp[...]![]()
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Dislocation lines in {110} sections of In-doped GaAs are imaged by scanning electron acoustic microscopy (SEAM). Cathodoluminescence measurements show the presence of a high indium concentration at dislocations. It is proposed that the semi-insu[...]![]()
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Urchulutegui, M. ; Piqueras de Noriega, Javier ; LLopis, J. | American Institute of Physics | 1989-04-01The capability of scanning electron?acoustic microscopy in the characterization of MgO crystals has been studied. The conditions for the observation of different surface and subsurface features in as?grown and deformed crystals are described and[...]![]()
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Urbieta Quiroga, Ana Irene ; Piqueras de Noriega, Javier ; Muñoz, V. | Elsevier Science SA | 2000-12-15ZnSe single crystals were grown from n-type microcrystalline boules by a Solid Phase Recrystallization (SPR) method. The recrystallizations were performed under different atmospheres, Ar or Se, and pressures to investigate the influence of growt[...]![]()
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Urbieta, C. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Muñoz, V. | Elsevier Science SA | 2001-03-22ZnSe single crystals were grown from n-type microcrystalline boules by :I solid phase recrystallization (SPR) method. During. SPP,. twinned regions appear with different electronic recombination properties. The recrystallizations were performed [...]![]()
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Urbieta, S. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Vasco, E. ; Zaldo, C | Wiley-V C H Verlag Gmbh | 2003-01Highly (001) textured ZnO films grown on (100)InP by pulsed laser deposition have been studied by Scanning Tunneling Microscopy (STM). Constant current images show a well defined grain structure, which allows to perform local spectroscopic studi[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P: S. ; Dieguez, E. | American Physical Society | 1999-10-15V- and Ru-doped GaSb crystals have been investigated by scanning tunneling spectroscopy in a combined scanning electron microscope-scanning tunneling microscope system. Local variations of surface band gap have been measured with high spatial re[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plaza, J. L. ; Dieguez, E. | American Institute of Physics | 1999-08-01Er doped GaSb single crystals have been studied by scanning tunneling spectroscopy (STS) and cathodoluminescence (CL) in a combined scanning electron microscope-scanning tunnelling microscope system. The surface band gap in doped samples has bee[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier ; Golubev, VG. ; Kurdyukov, D.A. ; Pevtsov, A. B. ; Zamoryanskaya, M. V. | Amer Inst Physics | 2002-11-13Scanning tunneling microscopy and scanning tunneling spectroscopy (STS) are used to investigate the local electronic behavior of Pt-Si nanostructures fabricated in an opal matrix formed by silica spheres of 250 nm diameter. Si and Pt are regular[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R | IOP publishing ltd | 2001-09Scanning tunnelling microscopy (STM) has been sometimes applied in recent years to characterize porous silicon. In contrast, other forms of light emitting Si, such as nanocrystalline silicon films, prepared by different methods, have not been, o[...]![]()
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Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Sekiguchi, T. | IOP publishing ltd | 2001-07Bulk ZnO single crystals grown by the hydrothermal and flux methods have been characterized by scanning tunnelling spectroscopy performed in the different crystalline faces. Normalized differential conductance has been found to depend on the fac[...]![]()
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Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Ortega Villafuerte, Yanicet | IOP publishing ltd | 2011-08Al-doped ZnO nanorod networks and other microstructures have been grown by a thermal evaporation–deposition method with a mixture of ZnS and Al_2O_3 powders as precursor. Some of the grown structures consist of star-like arrays of nanorods arran[...]![]()
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Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Elsever Science | 2009-03-15Sintering of a ZnS-SnO(2) mixture under argon flow leads to the growth of columnar nanoplate arrays as well as arrays of nanowires, nanorods and nanoplates with six-fold symmetry. The six-fold nanoplate structures correspond to a more advanced s[...]![]()
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Chioncel, M. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 2008-12-15?-Fe_2O_3 (hematite) nanostructures with various morphologies have been grown by thermal oxidation of compacted iron powder at temperatures between 700 and 900 degrees C. Different thermal treatments have been found to induce the growth of singl[...]![]()
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Alonso Orts, Manuel ; Sanchez, Ana M ; Hindmarsh, Steven A ; López, Iñaki ; Nogales Díaz, Emilio ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Amer Chemical Soc | 2017-01-11Tailoring the shape of complex nanostructures requires control of the growth process. In this work, we report on the selective growth of nanostructured tin oxide on gallium oxide nanowires leading to the formation of SnO_2/Ga_2O_3 complex nanost[...]![]()
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MgO crystals have been studied by scanning?electron acoustic microscopy under different experimental conditions. Contrast mechanisms in imaging are discussed and compared. The experimental results obtained by earthing or nonearthing the specimen[...]![]()
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Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma | World Scientific Publ Co Pte Ltd | 2007Sintering of ZnO-SnO_2 and ZnO-MgO mixtures, with few at. % of Sn or Mg at 1280 C under argon flaw leads to the growth of microrods on the sample surface, which are formed by oriented stacks of nanoplates. Energy dispersive spectroscopy and cath[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2008-11-12Sn doped GeO_2 nanowires and microwires have been grown by an evaporation-deposition method, using a mixture of Ge and SnO_2 powders as precursors. Comparison with undoped GeO_2 nanowires grown by the same method shows that the presence of Sn pr[...]