ALBERT — All Library Books, journals and Electronic Records Telegrafenberg

1

Digitale Medien

Interface growth with atoms and preformed clusters: Morphology and Schottky barrier variations for Au/InP(110) (1988)

Aldao, C. M. ; Vitomirov, I. M. ; Waddill, G. D. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 53 (1988), S. 2647-2649

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: With synchrotron radiation photoemission, we contrast the morphology and the Schottky barrier obtained when Au atoms are condensed onto InP(110) at 300 and ∼60 K to what is obtained when preformed, metallic Au clusters are deposited. Atom by atom deposition at either temperature leads to substrate disruption and Fermi level pinning 0.75 eV below the conduction-band minimum (CBM). Deposition of preformed Au clusters induces almost no disruption and a pinning position 0.42 eV below the CBM. Differences reflect the dependence upon the process, and therefore the energetics, of bringing dissimilar atoms in contact.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.100182

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

2

Digitale Medien

Fermi level movement for n- and p-GaAs interfaces: Effects of temperature and dopant concentration (1989)

Anderson, Steven G. ; Aldao, C. M. ; Waddill, G. D. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 55 (1989), S. 2547-2549

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Photoemission studies demonstrate that temperature and dopant concentration dependent movement of the surface Fermi level is controlled by coupling between adatom-induced and bulk states. At a low temperature for lightly doped n- or p-GaAs, initial band bending inhibits tunneling and EF remains near the band edges until the onset of metallicity. For heavy doping, greater band bending reflects a thinner depletion region. Thermal cycling for 20≤T≤300 K for low coverages demonstrates that band bending is reversible.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.101977

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

3

Digitale Medien

Abruptness of Au-Si contacts with thin CoSi2 interlayers (1987)

Xu, F. ; Aldao, C. M. ; Vitomirov, I. M. ; [weitere]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 51 (1987), S. 1946-1948

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: High-resolution synchrotron radiation photoelectron spectroscopy has been used to study Au/Si and Au/CoSi2/Si interface formation at room temperature. Our results show Au-Si intermixing, the absence of a well defined Au-Si compound, and surface segregation of small amounts of Si to the Au surface. An interlayer formed by the deposition of ≤3 A(ring) of Co has relatively small effect on this Au-Si atomic profile. Intermixing is abruptly quenched, however, when the Co deposition exceeds 3.5 A(ring), and a Au film free of Si can grow on the CoSi2 layer. These results demonstrate the effectiveness of CoSi2 layer as a barrier against Au-Si intermixing and identify the critical coverage of Co needed to passivate the Si surface.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.98309

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

4

Digitale Medien

Photoemission and inverse photoemission studies of La adatom interactions with YBa2Cu3O6.9 (1988)

Gao, Y. ; Wagener, T. J. ; Aldao, C. M. ; [weitere]

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 64 (1988), S. 1296-1300

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: The surface reactions that occur when adatoms of La are deposited onto the high-temperature superconductor YBa2Cu3O6.9 have been studied using high-resolution synchrotron radiation photoelectron spectroscopy and inverse photoelectron spectroscopy. These adatoms lead to the depletion of oxygen from the substrate as La-O forms at low coverage. The process of oxygen withdrawal quickly becomes kinetically limited as the thickening overlayer impedes mass transfer. At the same time, Cu atoms released from the disrupted, no-longer- superconducting substrate outdiffuse into, and segregate to the top of, the growing La overlayer. The complex reacted interface, therefore, exhibits phases which are likely to be superconducting, insulating, and metallic.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.341849

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

5

Digitale Medien

Prebreakdown conduction in zinc oxide varistors: Thermionic or tunnel currents and one-step or two-step conduction processes (1993)

Castro, M. S. ; Aldao, C. M.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 63 (1993), S. 1077-1079

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: This letter is aimed at understanding the intergranular conduction in zinc oxide varistors. In particular, we have studied current-voltage and Arrhenius plots of the resistive current for the prebreakdown conduction. A current-temperature (I-T) relation has been found to present two breaks at ∼370 and ∼240 K. Although this result can be interpreted as a consequence of distinct regimes, we found that experimental I-T curves can be theoretically reproduced by calculating currents for a double Schottky barrier. Experimental results were fitted with one- and two-step transport process models. It was found that a two-step model better reproduces the electrical properties of these devices.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.109838

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

6

Digitale Medien

Cooling rate effects in ZnO varistors (1992)

Castro, M. S. ; Perissinotti, L. ; Aldao, C. M.

Springer

Journal of materials science 3 (1992), S. 218-221

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1573-482X

Quelle: Springer Online Journal Archives 1860-2000

Thema: Elektrotechnik, Elektronik, Nachrichtentechnik , Maschinenbau

Notizen: Abstract Cooling rate effects on ZnO-Bi2O3 varistors are presented. In particular, the oxygen vacancies (V o + ) concentration was determined by electron paramagnetic resonance (EPR) spectroscopy and related to the conductivity. It was found that a higher cooling rate provokes an increase of the V o + concentration and a higher conductivity. Current density versus temperature curves are fitted with a modified Schottky barrier model which reflects a higher active donor concentration near the grain interface.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00703029

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

7

Digitale Medien

Ammonia decomposition on polycrystalline Pt at pressures between 1.3 and 93 kPa (1985)

Resasco, D. E. ; Abello, M. C. ; Aldao, C. M. ; [weitere]

Springer

Reaction kinetics and catalysis letters 28 (1985), S. 407-410

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 1588-2837

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Beschreibung / Inhaltsverzeichnis: Abstract Измерена кинетика разложения аммиака на поликристаллической Pt в интервале температур 600–1700 К и при давлениях от 1,3 до 93 кПа, которая подчиняется уравнению Пангмюра-Хиншельвуда для скорости мономолекулярной реакции. Это уравнение скорости, как уже ранее установлено, соответствует данным в том же интервале температур, но для давлений от 2 до 1400 Па.

Notizen: Abstract The kinetics of ammonia decomposition on polycrystalline Pt at temperatures between 600 and 1700 K and at pressures between 1.3 and 93 kPa were measured and correlated with a Langmuir-Hinshelwood unimolecular reaction rate expression. This rate expression had previously been shown to fit data in the same temperature range for pressures between 2 and 1400 Pa.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02062973

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

Volltext

8

Digitale Medien

Exact one-band model calculation using the tight-binding method (1998)

Mirabella, D. A. ; Aldao, C. M. ; Deza, R. R.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 68 (1998), S. 285-291

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 0020-7608

Schlagwort(e): tight-binding ; band spectrum ; orbital nonorthogonality ; Chemistry ; Theoretical, Physical and Computational Chemistry

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A one-dimensional one-band model is presented which enables a tight-binding calculation to be performed with full rigor. All the multicenter integrals involved in the calculation of the Hamiltonian matrix elements can be analytically computed in terms of a single parameter: the ratio between the lattice spacing and the extension of the “atomic” wave function. Moreover, the exact expression for the spectrum shows how the usual approximations of limiting the range of interactions and neglecting the nonorthogonality of the basis set degrade the results of the calculations. © 1998 John Wiley & Sons, Inc. Int J Quant Chem 68: 285-291, 1998

Zusätzliches Material: 4 Ill.

Materialart: Digitale Medien

Permalink

	Standort	Signatur	Erwartet	Verfügbarkeit

Andere fanden auch interessant ...

Artikel (Nationallizenzen)

9

Digitale Medien

Thermal conductivity of plastic foams (1983)

Williams, R. J. J. ; Aldao, C. M.

Stamford, Conn. [u.a.] : Wiley-Blackwell

Polymer Engineering and Science 23 (1983), S. 293-298

zur Merkliste hinzufügen auf der Merkliste

Details

ISSN: 0032-3888

Schlagwort(e): Chemistry ; Chemical Engineering

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: A simple equation enabling the prediction of the thermal conductivity of plastic foams, without the aid of adjustable parameters, is proposed. The equation is based on a recurrent method, previously developed, that showed reasonable agreement with experimental results. Ways of decreasing the thermal radiation contribution are shown. In particular, the influence of cell size, radiation transmission through solid membranes, and low-emissivity boundary surfaces are analyzed. Errors involved in steady techniques of measuring the thermal conductivity associated with radiation are discussed.

Zusätzliches Material: 7 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/pen.760230602

Permalink