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Autor Piqueras de Noriega, Javier |
Documentos disponibles escritos por este autor (322)
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Urbieta Quiroga, Ana Irene ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Amer Inst Physics | 2004-12-13Sintering CdSe powder under argon flow at temperatures in the range 800-900 degreesC produces the formation of needles on the sample surface. Bundles of parallel needles of a diameter of about 50 nm give rise to a domain-like appearance in the s[...]![]()
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Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2005-02-15Sintering SnO_2 under argon flow at temperatures in the range of 1350-1500 degreesC causes the formation of wires, rods, and tubes on the sample surface. At high temperatures of the mentioned range, microwires with lengths of hundreds of microns[...]![]()
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Sintering of ZnO pressed powder under Ar flow at temperatures between 1250 and 1300 degrees C leads to the formation of elongated microstructures and nanostructures, with different morphologies, on the sample surface. Rods and needles with cross[...]![]()
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Nanorods of titanium oxide (TiO_2) were obtained by thermally activated growth process carried out on pellets of nanocrystalline powder with mixed anatase and rutile structures. The nanostuctured array consists of nanorods with length between 30[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2007-04-18High aspect ratio GeO_2 nano- and microwires have been grown by thermal treatment at 600 degrees C of compacted Ge powder under argon flow. The wires have cross-sectional dimensions from less than 100 nm to about 1 mu m, depending on the duratio[...]![]()
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Bartolomé Vílchez, Javier ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Amer Inst Physics | 2015-11-09The mechanical resonance behavior of as-grown In_2O_3 microrods has been studied in this work by in-situ scanning electron microscopy (SEM) electrically induced mechanical oscillations. Indium oxide microrods grown by a vapor–solid method are na[...]![]()
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Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | American Institute of Physics | 1996-07-15Cathodoluminescence (CL) of YBa_2Cu_3O_(7-x) single crystals has been investigated in the scanning electron microscope, Some regions of the crystals, generally related to steps or other growth features, show enhanced CL Intensity. Spectra show t[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P. S. | Materials Research Society | 1998Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the effect of doping with an isoelectronic dopant, aluminum, on the native accepters and on the general structure of extended defects of gallium anti[...]![]()
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Bazta, Otman ; Urbieta Quiroga, Ana Irene ; Trasobares, Susana ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Addou, Mohammed ; Calvino, Jose Juan ; Hungría, Ana Belén | MDPI | 2020-05Pure and Ce-modified ZnO nanosheet-like polycrystalline samples were successfully synthesized by a simple and fast microwave-based process and tested as photocatalytic materials in environmental remediation processes. In an attempt to clarify th[...]![]()
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In-doped gallium oxide micro- and nanostructures: morphology, structure, and luminescence properties
López, Iñaki ; Utrilla, Antonio D. ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Peche, Andrea ; Ramirez Castellanos, J. ; González Calbet, José M. | Amer Chemical Soc | 2012-02-16The influence of indium doping on morphology, structural, and luminescence properties of gallium oxide micro- and nanostructures is reported. Indium-doped gallium oxide micro- and nanostructures have been grown by thermal oxidation of metallic g[...]![]()
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Bartolomé Vílchez, Javier ; Hidalgo Alcalde, Pedro ; Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | American Institute of Physics | 2014-04-21Electric field induced mechanical resonances of In2O3 microrods are studied by in-situ measurements in the chamber of a scanning electron microscope. Young's moduli of rods with different cross-sectional shapes are calculated from the resonance [...]![]()
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Piqueras de Noriega, Javier ; Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma ; Häußler, Dietrich ; Jäger, Wolfgang | IOP publishing ltd | 2013-10-02ZnO nanorods with Sn core regions grown by a thermal evaporation–deposition method from a mixture of SnO_2 and ZnS powders as precursors, are used to study the behaviour of liquid metal in the nanotubes' core regions and the formation of liquid [...]![]()
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Maestre Varea, David ; Cremades Rodríguez, Ana Isabel ; Gregorati, Luca ; Piqueras de Noriega, Javier | American Chemical Soc. | 2010-03-04Mixtures of InN and SnO2 powders, with it weight ratio of 10:1, have been used as precursors for the thermal growth of arrow-shaped and other elongated micro- and nanostructures of indium-tin oxide (ITO) containing about 2.6 atom % of Sit. The t[...]![]()
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Alemán, B. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Amer Inst Physics | 2009-07-06Indium-zinc-oxide (IZO) nanobelts have been grown by a thermal evaporation-deposition method with ZnO and In-2O_3 powders as precursors. The nanobelts have a superlattice structure that is explained by the formation of In-O and In/Zn-O layers, w[...]![]()
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Bartolomé Vílchez, Javier ; Maestre Varea, David ; Amati, Mateo ; Cremades Rodríguez, Ana Isabel ; Piqueras de Noriega, Javier | Amer Chemical Soc | 2011-04-28Micropyramids of zinc-doped indium oxide have been grown by thermal treatments of compacted InN and ZnO powders at temperatures between 700:and 900 degrees C Under argon flow. X-ray diffraction (XRD) measurements and energy-dispersive X-ray (EDS[...]![]()
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Rodríguez Fernández, Beatriz ; Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | Royal Society of Chemistry | 2020-03-23The growth mechanism of layered alpha-MoO_3 nano- and microplates on the surface of Mo wires during Joule heating has been investigated by application of an external electric field to the current carrying wire. The observed rapid growth of the s[...]![]()
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Garcia, J. A. ; Remon, A. ; Piqueras de Noriega, Javier | American Institute of Physics | 1987-10-01The effect of the addition of Bi and Mn on the photoluminescence from ZnO ceramics has been investigated. The effect of the presence of impurities on the green luminescence band can be compared to the effect of oxidizing treatments. A narrow gre[...]![]()
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Castaldini, A. ; Cavallini, A. ; Fraboni, B ; Piqueras de Noriega, Javier ; Méndez Martín, Bianchi | IOP publishing ltd | 1994Homogeneity, distribution and nature of defects in GaAs:Te wafers with different doping concentrations have been investigated by SPV (Surface PhotoVoltage) and EBIC (Electron Beam Induced Current) methods. The resulting radial distribution of th[...]![]()
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Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | IOP publishing ltd | 1998-08The effect of indentation on the cathodoluminescence (CL) of GaN:Si epitaxial films has been investigated in the scanning electron microscope. Deformation produces changes in the defect structure which are monitored through the changes induced i[...]![]()
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Díaz-Guerra Viejo, Carlos ; Vicent López, José Luis ; Piqueras de Noriega, Javier ; Dieguez, E. | IOP publishing ltd | 2007-01-07The influence of the doping level on the radiative recombination properties of GaSb:Se crystals has been investigated by cathodoluminescence (CL) microscopy and spectroscopy in the scanning electron microscope. CL images evidence a high dislocat[...]![]()
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Hidalgo Alcalde, Pedro ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Dutta, P. S. ; Dieguez, E. | IOP publishing ltd | 1997Cathodoluminescence (CL) in the scanning electron microscope (SEM) has been used to investigate the effect of doping with chromium and vanadium on the native accepters and on the general structure of extended defects of gallium antimonide single[...]![]()
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Vásquez, G. Cristian ; Andrea Peche-Herrero, M. ; Maestre Varea, David ; Alemán Llorente, Belén ; Ramirez-Castellanos, Julio ; Cremades Rodríguez, Ana Isabel ; Gonzalez-Calbet, José M. ; Piqueras de Noriega, Javier | Royal Soc. Chemistry | 2014Anatase TiO_2 nanoparticles doped with Al or Fe have been synthesized via a modified Pechini method which allows to reach high control in size and composition. Microstructural analysis onfirms the good crystallinity of the doped anatase nanopar[...]![]()
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Gonzalo, Alicia ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2014-02Mn doped –Ga_2O_3 nanowires have been obtained by a thermal evaporation method on a gallium oxide substrate. The growth temperature has been varied in the range 1300-1500 ºC. The morphology of the resulting structures has been found to depend on[...]![]()
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Piqueras de Noriega, Javier ; Sotillo Buzarra, Belén ; Ortega Villafuerte, Yanicet ; Fernández Sánchez, Paloma | RSC Royal Society of Chemistry | 2013Pure and In-doped ZnS structures have been grown using a VS method. Thermal treatments have been performed at temperatures ranging from 1000 to 1200 °C, during 15 to 17 hours in a N_2 overpressure environment. Nanowires and nanoribbons are the m[...]![]()
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López, I ; Alonso Orts, Manuel ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier | IOP publishing ltd | 2016-11Gallium oxide microrods have been grown by an evaporation-deposition method by using a precursor containing lithium in order to check the influence of such dopant on the morphology and physical properties of the obtained ß-Ga_2O_3 structures. SE[...]![]()
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Gómez, P. ; Piqueras de Noriega, Javier ; Sayagues, M. J. ; Gonzálezcalbet, J. M. | Pergamon-Elsevier Science Ltd | 1995-10The influence of oxygen content of YBa_2Cu_3O_(7-x) ceramic samples on the cathodoluminescence emission has been studied in the scanning electron microscope. No luminescent band has been related to the presence of native oxygen vacancies in untr[...]![]()
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López, Iñaki ; Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Peche, Andrea ; Ramirez-Castellanos, Julio ; Gonzalez-Calbet, José M. | Amer Chemical Soc | 2013-02-14Elongated micro- and nanostructures of Sn doped or Sn and Cr codoped monoclinic gallium oxide have been grown by a thermal method. The presence of Sn during growth has been shown to strongly influence the morphology of the resulting structures, [...]![]()
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Cathodoluminescence (CL) scanning electron microscopy has been used to investigate the nature and distribution of defects involved in the infrared emission of GaAs:Te wafers. Spectral and CL-contrast changes as a function of doping level have be[...]![]()
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Influence of thermal environments on the growth of bulk cadmium zinc telluride (CZT) single crystals
Carcelen, V. ; Vijayan, N. ; Rodríguez Fernández, J. ; Hidalgo Alcalde, Pedro ; Piqueras de Noriega, Javier ; Sochinskii, N. V. ; Pérez, J. M. ; Dieguez, E. | Elsevier Science BV | 2009-02-15The II-VI compound semiconductor crystal cadmium zinc telluride (CZT) is very important in the field of room-temperature radiation detectors and medical imaging applications. In the present study, bulk CZT single crystal has been grown by (i) os[...]![]()
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Bazta, Otman ; Urbieta Quiroga, Ana Irene ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; Addou, M. ; Calvino, J.J. ; Hungría, A.B. | Elsevier Science Ltd | 2019-04-15This study reports on the deposition of highly transparent, n-type ZnO thin films on glass substrate at 450 C using spray pyrolysis processing, with the simultaneous insertion of yttrium (Y) at different percentages (0, 2, 5, 7 at%) as a dopant.[...]![]()
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Cremades Rodríguez, Ana Isabel ; Narayanan, V.C. ; Piqueras de Noriega, Javier ; Lima, A.P. ; Ambacher, O. ; Stutzmann, M. | American Institute of Physics | 2001-11-01Plasma-induced molecular beam epitaxial AlInGaN heterostructures have been characterized by spatial resolved cathodoluminescence and x-ray energy dispersive microanalysis. Competitive incorporation of Al and In has been observed, with the format[...]![]()
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Castaldini, A. ; Cavallini, A. ; Fraboni, B. ; Piqueras de Noriega, Javier | Elsevier Science SA | 1994-12The disappearance of the electron trap at E_t=E_c-0.82 eV (EL2) level in highly doped samples, observed in the literature for N_D-N_A> 1x10^17 cm^(-3) has been assessed by junction spectroscopy investigations of liquid-encapsulated Czochralski G[...]![]()
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Vila, Mercedes ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | Amer Inst Physics | 2012-08-13The ?-Bi_2O_3 to ?- Bi_2O_3 phase transformation has been locally induced by laser irradiation in ceramic samples and single-crystal nanowires of this oxide. The threshold power densities necessary to induce this transformation, as well as the [...]![]()
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Piqueras de Noriega, Javier ; Vila Santos, María ; Díaz-Guerra Viejo, Carlos | Amer Inst Physics | 2012-08-13The ?-Bi_2O_3 to ?-Bi_2O_3phase transformation has been locally induced by laser irradiation in ceramic samples and single-crystal nanowires of this oxide. The threshold power densities necessary to induce this transformation, as well as the cor[...]![]()
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Domínguez-Adame Acosta, Francisco ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma | Amer Inst Physics | 1991-01-21Near-infrared cathodoluminescence (CL) in the scanning electron microscope has been used to characterize GaP:S. Spectra of as-grown crystals show a broadband at about 1240 nm, probably related to P(Ga) antisite defects. This emission has been fo[...]![]()
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Piqueras de Noriega, Javier ; Vila Santos, María ; Díaz-Guerra Viejo, Carlos | Elsevier Science SA | 2012-03-15Cathodoluminescence in the scanning electron microscope and photoluminescence in a confocal microscope have been used to investigate the luminescence properties of the stable monoclinic ?-phase of Bi_2O_3. Powders of this oxide have been sintere[...]![]()
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Alemán Llorente, Belén ; Piqueras de Noriega, Javier ; Fernández Sánchez, Paloma ; García Martínez, José Ángel | Academic Press Ltd - Elsevier Science Ltd | 2013-04Luminescence of Zn_4In_2O_7 nanobelts and microplates synthesized by a thermal evaporation-deposition method, has been investigated by photoluminescence (PL) and cathodoluminescence (CL) in the scanning electron microscope (SEM). Time resolved a[...]![]()
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Domínguez-Adame Acosta, Francisco ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Prieto, P. | American Institute of Physics | 1992-03-15Visible and near infrared cathodoluminescence of Bi_2Sr_2CaCu_2O_x and YBa_2Cu_3O_(7-x) films is investigated in the scanning electron microscope. In particular, possible analogies in the cathodoluminescence of both systems have been analyzed. T[...]![]()
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Nogales Díaz, Emilio ; Méndez Martín, Bianchi ; Piqueras de Noriega, Javier ; Plugaru, R ; Garcia, J. A. ; Tate, T. J. | Materials Research Society | 2002The luminescence properties of erbium oxide grown on crystalline and amorphous silicon substrates were studied by means of photo- and cathodoluminescence techniques. Differences in the luminescence spectra for samples grown on the two type., of [...]![]()
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Zaldivar, M.H. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | American Institute of Physics | 1998-01-01Cathodoluminescence (CL) in the scanning electron microscope is used to investigate the nature of defects responsible for the luminescence associated with round and hexagonal-like topographic features of GaN:Si films. Round hillocks of the size [...]![]()
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Chioncel, M. F. ; Díaz-Guerra Viejo, Carlos ; Piqueras de Noriega, Javier | IOP publishing ltd | 2004-03Cathodoluminescence in the scanning electron microscope has been used to investigate the effect of plastic deformation, produced by indentation, in Te-doped GaSb crystals. Deformation has been found to cause a strong quenching of the luminescenc[...]![]()
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Gómez, P. ; Piqueras de Noriega, Javier ; Remon, A. ; Garcia, J. A. ; Jiménez, J. ; Torres, A. | Wiley-V C H Verlag Gmbh | 1996-10-16The effect of vacuum thermal annealing and electron irradiation on the luminescence of Bi_2Sr_2CaCu-2O_x ceramics has been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM), time-resolved photoluminescence (PL), [...]![]()
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Radoi, R. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier ; Wiggins, M. S. ; Solís, J. | IOP publishing ltd | 2003-07The effect of mechanical milling on the luminescence properties of ZnO microcrystalline samples has been studied by means of cathodoluminescence in a scanning electron microscope. The samples consisted of pressed pellets of commercially availabl[...]![]()
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Radoi, R. ; Andrés, M. ; Fernández Sánchez, Paloma ; Piqueras de Noriega, Javier | Wiley-V C H Verlag Gmbh | 2004-11ZnSe powder has been ball milled in different conditions to investigate the formation of a nanocrystalline structure. The effect of mechanical milling on the luminescent and structural properties of ZnSe has been studied by means of cathodolumin[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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[...]![]()
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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 [...]