Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Ion-beam-assisted deposition of ferroelectric PbTiO3 films (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 74 (1993), S. 2896-2899 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Ferroelectric PbTiO3 films were deposited by ion-beam-assisted deposition (O2+Ar 75–150 eV). The effects of ion bombardment on the Pb/Ti ratio and the structures of the film are discussed. For a given target-substrate distance and substrate temperature, the Pb/Ti ratio decreased with increasing bombarding beam energy. Compared with the films deposited without ion bombardment, the deposition rate was increased under ion bombardment, which is attributed to an increase in the surface reaction rate. The crystal grains are larger for films deposited under ion bombardment, which implies that ion bombardment enhances the surface mobility of adatoms and hence the growth kinetics of the growing films. Dielectric and ferroelectric properties of the as-deposited films are also reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.354644
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Local texture and percolative paths for long-range conduction in high critical current density TlBa2Ca2Cu3O8+x deposits (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 64 (1994), S. 106-108 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A possible microstructural origin of the high critical current densities which have been obtained in c-axis-aligned, polycrystalline TlBa2Ca2Cu3O8+x deposits has been identified. The results of x-ray diffraction determinations of basal plane texture of Tl-1223 deposits prepared by spray pyrolysis are observed to depend on the size of the x-ray beam. Furthermore, most grain boundaries were found from transmission electron microscopy to have small misorientation angles. It is concluded that although overall the basal plane orientations are nearly random, there is a high degree of local texture indicative of colonies of similarly oriented grains. The spread in a-axis orientation within a colony is ∼10°–15°. Intercolony conduction, it is suggested, may be enhanced by a percolative network of small-angle grain boundaries at colony interfaces.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.110908
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Multiple inelastic scattering in high-energy electron diffraction and imaging (1991)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 47 (1991), S. 686-698 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A dynamical multiple elastic and inelastic electron scattering theory is proposed and is applied to the plural scattering cases of phonon, single-electron and valence (or plasmon) excitations. The incoherence of all the possible inelastic scattering processes of different energies and momenta is evaluated analytically before any numerical calculations. The effects of multiple scattering are equivalent partially to the broadening of the scattering function of a single inelastic process by those of others and partially to the re-scattering of the Kikuchi pattern produced in one inelastic process by others. The final diffraction pattern is a convoluted result of those Kikuchi patterns produced by different inelastic scattering processes. All these characteristics can be considered in just one single formula. The theory of multiple-phonon excitations in simulating high-angle annular-dark-field (ADF) scanning transmission electron-microscopy (STEM) images is proposed. It is shown that the single-phonon scattering model is a good approximation except at the points close to atomic nuclei if the electron probe is comparable in size to that of an atom. The higher-order phonon scattering may improve the resolution of the ADF STEM images of thin crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767391005524
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Dynamical simulations of energy-filtered inelastic electron diffraction patterns (1992)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 48 (1992), S. 674-688 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: The previously proposed inelastic scattering theory [Wang (1991). Acta Cryst. A47, 686–698] has been applied to simulate the diffraction patterns of phonon, plasmon-loss and atomic core-shell scattered electrons. The details of the calculation method and the program flow chart are described here. The calculated thermal diffuse scattering (TDS) patterns using full lattice dynamics agree well with the experimental observations for parallel- and convergent-beam-illumination cases. The results have shown that the Kikuchi pattern is mainly produced by phonon-scattered electrons and that the Einstein model is not a good thermal-vibration model, at least for molybdenum and silicon. Under strongly diffracting conditions, calculations for energy-filtered diffraction patterns of core ionization edges have shown that the elastic and inelastic scattering can no longer be considered as independent and that the angular distribution of the inelastically scattered electrons cannot be simply described by the Lorentzian function. All these dynamical effects can affect the compositional microanalysis in electron energy-loss spectroscopy (EELS).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767392002897
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Electron virtual inelastic scattering in the multislice scheme (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 366-371 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A multislice theory has been developed for including the virtual inelastic scattering in dynamical calculations of high-energy electron diffraction. The effects on elastic waves of all inelastic processes, such as single-electron excitation, plasmon excitation and phonon scattering, can be characterized by a complex correction potential. Its real part describes the virtual inelastic process and its imaginary part represents the inelastic absorption effect. This potential is directly related to the generalized dielectric response function of the crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767389013607
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Structure of an erbium complex with L-proline (1993)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 49 (1993), S. 2086-2089 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270193005311
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Interface and grain boundary structures in YBa2Cu3O7-x and YBa2Cu4O8 materials (1994)
    Springer
    Interface science 1 (1994), S. 321-337 
    Details
    ISSN: 1573-2746
    Keywords: Y2BaCuO5-YBa2Cu3O7-x interface ; point defeets ; flux pinning ; cation nonstoichiometry ; grain boundary chemistry ; oxygen deficiency ; hole density ; grain boundary misorientation ; high-resolution transmission electron microscopy (HRTEM) ; energy dispersive X-ray spectroscopy (EDS) ; electron energy-loss spectroscopy (EELS)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Y2BaCuO5YBa2Cu3O7-x (Y211/Y123) interfaces in melt-processed YBa2Cu3O7-x were studied by high-resolution transmission electron microscopy and energy dispersive X-ray spectroscopy. Yttrium enrichment and barium depletion were observed locally at the Y211/Y123 interfaces where Y123 (001) facets were present. This effect may be interpreted as the result of lattice substitution of Ba by Y near these interfaces. Cation nonstoichiometry was found near Y211/Y123 interfaces where liquid phases (Cu-Ba-O) were present. This chemical disorder introduces numerous point defects in the Y123, and these defects may act as additional pinning sites alongwith stacking faults. A comparison of grain boundary (GB) chemical composition in polycrystalline YBa2Cu3O7-x and YBa2Cu4O8(Y124), studied using nanoprobe parallel-detection electron energy-loss spectroscopy (EELS), is presented. The studies of Y124 show that stoichiometric grain boundaries can also form weak links between superconducting grains. It is suggested that weak-link behavior is determined largely by misorientation at grain boundaries.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00188702
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Uranyl luminescence decay in phosphoric acid solution (1993)
    Springer
    Journal of radioanalytical and nuclear chemistry 175 (1993), S. 81-94 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract Uranyl luminescences in phosphoric acid system has been studied. Uranyl excited by a nitrogen laser shows single or biexponential luminescence decays in the phosphoric acid system. When the uranyl ion or phosphoric acid concentration are lower, a single exponential luminescence decay appears, whereas at higher uranyl ion or phosphoric acid concentrations, biexponential decay is observed. Time-resolved spectra of uranyl in this system are measured. The reasons of the phenomena are tentatively established.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02164108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Reflection electron energy-loss spectroscopy and imaging for surface studies in transmission electron microscopes (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Microscopy Research and Technique 20 (1992), S. 390-405 
    Details
    ISSN: 1059-910X
    Keywords: Reflection electron microscopy ; Secondary electron imaging ; Field emission gun ; In situ REM ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: A review is given on the techniques and applications of high-energy reflection electron energy-loss spectroscopy (REELS) and reflection electron microscopy (REM) for surface studies in scanning transmission electron microscopes (STEM) and conventional transmission electron microscopes (TEM). A diffraction method is introduced to identify a surface orientation in the geometry of REM. The surface dielectric response theory is presented and applied for studying α-alumina surfaces. Domains of the α-alumina (012) surface initially terminated with oxygen can be reduced by an intense electron beam to produce Al metal; the resistance to beam damage of surface domains initially terminated with Al+3 ions is attributed to the screening effect of adsorbed oxygen. Surface energy-loss near-edge structure (ELNES), extended energy-loss fine structure (EXELFS), and microanalysis using REELS are illustrated based on the studies of TiO2 and MgO. Effects of surface resonances (or channeling) on the REELS signal-to-background ratio are described. The REELS detection of a monolayer of oxygen adsorption on diamond (111) surfaces is reported.It is shown that phase contrast REM image content can be significantly increased with the use of a field emission gun (FEG). Phase contrast effects close to the core of a screw dislocation are discussed and the associated Fresnel fringes around a surface step are observed. Finally, an in situ REM experiment is described for studying atomic desorption and diffusion processes on α-alumina surfaces at temperatures of 1,300 - 1,400°C.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1070200409
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Imaging friction tracks at diamond surfaces using reflection electron microscopy (1991)
    New York, NY : Wiley-Blackwell
    Journal of Electron Microscopy Technique 17 (1991), S. 231-240 
    Details
    ISSN: 0741-0581
    Keywords: Plastic deformation ; Adhesion friction ; Local contacting pressure ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Natural Sciences in General
    Notes: Reflection electron microscopy (REM) is applied to image the structure of polished natural diamond (001) surfaces (of 5 × 4 mm size) after friction experiments under a pressure below the critical value. Friction tracks marked by a diamond needle after a single pass movement under a pressure of 13 GPa can be seen in REM images and show non-uniform contrast. The surface shows relatively dark image contrast at the light contacted area, which is possibly due to the structural modification at the top atomic layer. The high local contacting pressure pushes part of the needle into the surface which causes fracture, resulting in the formation of grooves at the surface. It is possible to have plastic deformation in this process, but no evidence has been found for the presence of cracking. The observations support the adhesion frictional mechanism rather than the micro-cleavage model.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jemt.1060170210
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...