Literatura académica sobre el tema "Pseudomorphic overlayers"

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Artículos de revistas sobre el tema "Pseudomorphic overlayers"

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SINGH, RANBER. "MAGNETIC COUPLING IN PSEUDOMORPHIC 2ML OVERLAYERS AND SANDWICH SUPERLATTICE STRUCTURES OF Cr, Mn, Fe, Co AND Ni ON FCC Cu(001)". International Journal of Modern Physics B 24, n.º 04 (10 de febrero de 2010): 405–12. http://dx.doi.org/10.1142/s0217979210055007.

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The magnetic coupling in pseudomorphic overlayer and sandwich structures of 2ML magnetic ultrathin films on Cu (001) substrate is investigated by using spin-polarized density functional theory. The 2ML magnetic overlayers have significant magnetic moment except CrNi overlayer for which magnetic moment is very small (0.004 μB/ atom ). The overlayers having one layer of Cr turn out to be antiferromagnetically coupled except CrNi/Cu overlayer which has ferromagnetic coupling. All other overlayers have ferromagnetic coupling. In contrast to ferromagnetic MnMn/Cu overlayer, the Cu/MnMn/Cu sandwich has antiferromagnetic coupling. Similar to CrFe/Cu overlayer, the Cu/CrFe/Cu sandwich has antiferromagnetic coupling, while all other sandwiches have ferromagnetic coupling. The sandwiched structures have reduced magnetic moment as compared to their overlayer counterparts. The MnMn , MnFe , and MnCo sandwiches have highly reduced magnetic moment as compared to their overlayer counterparts.
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Dodson, Brian W. "Strain-induced surface segregation and ordering in pseudomorphic metal-alloy overlayers". Physical Review B 36, n.º 12 (15 de octubre de 1987): 6288–91. http://dx.doi.org/10.1103/physrevb.36.6288.

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Sham, T. K. "Mn 3s multiplet splitting of pseudomorphic Mn overlayers on Ru(001)". Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 14, n.º 4 (julio de 1996): 3199. http://dx.doi.org/10.1116/1.588807.

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Kibler, L. A., A. M. El-Aziz y D. M. Kolb. "Electrochemical behaviour of pseudomorphic overlayers: Pd on Au(1 1 1)". Journal of Molecular Catalysis A: Chemical 199, n.º 1-2 (mayo de 2003): 57–63. http://dx.doi.org/10.1016/s1381-1169(03)00018-9.

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Légaré, P., G. F. Cabeza y N. J. Castellani. "Numerical Simulation of Pt Overlayers on Ni(111) and Co(0001)". Surface Review and Letters 05, n.º 02 (abril de 1998): 581–88. http://dx.doi.org/10.1142/s0218625x98000967.

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The growth of pseudomorphic Pt layers (from one to four) on Ni(111) and Co(0001) has been investigated by the ECT–BFS method. The behaviors on the two substrates are very similar. The growth of the first layer appears to be highly favorable as the energy of the system is negative. Higher coverages could be stabilized with huge relaxations perpendicularly to the surface. The evolution of the plane-by-plane energies (separated in stress and chemical contributions) and relaxations during the growth is presented and discussed. The always-stabilizing chemical interaction at the interface makes it likely that interdiffusion of metals could be a competing mechanism.
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Lischka, Markus, Christian Mosch y Axel Groß. "Tuning catalytic properties of bimetallic surfaces: Oxygen adsorption on pseudomorphic Pt/Ru overlayers". Electrochimica Acta 52, n.º 6 (enero de 2007): 2219–28. http://dx.doi.org/10.1016/j.electacta.2006.03.113.

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Pallassana, Venkataraman, Matthew Neurock, Lars B. Hansen, Bjørk Hammer y Jens K. Nørskov. "Theoretical analysis of hydrogen chemisorption on Pd(111), Re(0001) andPdML/Re(0001),ReML/Pd(111)pseudomorphic overlayers". Physical Review B 60, n.º 8 (15 de agosto de 1999): 6146–54. http://dx.doi.org/10.1103/physrevb.60.6146.

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Golfetto, E., A. Baraldi, M. Pozzo, D. Alfè, A. Sala, P. Lacovig, E. Vesselli, S. Lizzit, G. Comelli y R. Rosei. "Determining the Chemical Reactivity Trends of Pd/Ru(0001) Pseudomorphic Overlayers: Core-Level Shift Measurements and DFT Calculations". Journal of Physical Chemistry C 114, n.º 1 (27 de octubre de 2009): 436–41. http://dx.doi.org/10.1021/jp908568v.

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Pallassana, Venkataraman, Matthew Neurock y George W. Coulston. "Theoretical Density Functional Analysis of Maleic Anhydride Chemisorption on Pd(111), Re(0001), and Bimetallic PdML/Re(0001) and PdML/Mo(110) Pseudomorphic Overlayers". Journal of Physical Chemistry B 103, n.º 42 (octubre de 1999): 8973–83. http://dx.doi.org/10.1021/jp991519o.

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Aitchison, Hannah, Nikolaus Meyerbröker, Tien-Lin Lee, Jörg Zegenhagen, Thomas Potter, Herbert Früchtl, Izabela Cebula y Manfred Buck. "Underpotential deposition of Cu on Au(111) from neutral chloride containing electrolyte". Physical Chemistry Chemical Physics 19, n.º 35 (2017): 24146–53. http://dx.doi.org/10.1039/c7cp04244b.

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Tesis sobre el tema "Pseudomorphic overlayers"

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Lacovig, Paolo. "Electronic structure, morphology and chemical reactivity of nanoclusters and low-dimensional systems: fast photoemission spectroscopy studies". Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3685.

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2008/2009
L'obiettivo di questa tesi è l'applicazione della spettroscopia di fotoemissione allo studio di nanoparticelle supportate e di sistemi a bassa dimensionalità. Ad una primo periodo dedicato allo sviluppo del rivelatore e del software per un nuovo analizzatore d'energia per elettroni installato presso la linea di luce SuperESCA ad Elettra, è seguita una fase durante la quale ho eseguito una serie di esperimenti mirati ad esplorare le potenzialità del nuovo apparato sperimentale. Il primo risultato ottenuto riguarda la comprensione della relazione che intercorre tra le variazioni della reattività chimica del sistema Pd/Ru(0001) e il numero degli strati di Pd cresciuti in modo pseudomorfico sul substrato di rutenio. La risoluzione temporale raggiunta con la nuova strumentazione ci ha permesso di studiare processi dinamici su una scala temporale fino ad ora inaccessibile per la spettroscopia di fotoemissione dai livelli di core: in particolare abbiamo studiato la crescita del grafene ad alta temperatura sulla superficie (111) dell'iridio e la reattività chimica di nanocluster di Pt supportati su MgO. Nel primo caso abbiamo messo in evidenza come la formazione del grafene proceda attraverso la nucleazione di nano-isole di carbonio che assumono una peculiare forma di cupola. Nel secondo caso siamo riusciti a seguire sia la dinamica del processo di adsorbimento di CO, sia la reazione CO + 1/2 O2 -> CO2 sulle nanoparticelle di Pt depositate su un film ultra-sottile di ossido di magnesio. Infine, abbiamo caratterizzato la morfologia di nanoparticelle di Pd, Pt, Rh e Au cresciute su diversi substrati a base di carbonio, in particolare grafite, nanotubi a parete singola e grafene. Tra i vari risultati abbiamo compreso come l'interazione metallo-substrato dipenda dalla dimensione delle nano-particelle e abbiamo evidenziato il ruolo centrale dei difetti del substrato nei processi di nucleazione e intercalazione.
The objective of this thesis is the application of photoelectron spectroscopy for the investigation of supported nanoclusters and low-dimensional systems. After a first stage devoted to the development of the detector and the software for the electron energy analyser installed on the SuperESCA beamline at Elettra, during the PhD project I've performed a series of experiments aimed to explore the capabilities of the new experimental apparatus. One of the first results concerns the understanding of the relation between the modifications in the chemical reactivity of the Pd/Ru(0001) system and the thickness of the pseudomorphically grown Pd overlayer. The temporal resolution achieved with the new experimental set-up allowed us to study dynamical processes on a new time scale, in particular the graphene growth process at high temperature on the Ir(111) surface and the chemical reactivity of Pt nanoclusters supported on MgO. In the former case, we discovered that graphene formation proceeds via preliminary nucleation of dome-shaped C nano-islands. In the second case, we succeded in following both the dynamics of CO adsorption process and the CO + 1/2 O2 -> CO2 reaction on Pt nanoclusters grown on a ultra-thin film of magnesium oxide. Finally, the morphology of Pd, Pt, Rh and Au nanoclusers grown on different carbon-based substrates (namely graphite, single-walled carbon nanotubes and graphene) has been characterized. Among the results we report the understanding of the dependence of the metal-substrate interaction on the cluster size and the role of defects in the nucleation and intercalation processes.
XXII Ciclo
1972
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