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
Filter
  • 2000-2004  (1)
  • 1990-1994  (8)
  • 1960-1964  (8)
  • 1930-1934  (2)
Source
Material
Years
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Photoconduction in fullerene films (1994)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 65 (1994), S. 758-760 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report results from a detailed study of photoconduction in C60 films. At low temperatures the photoaction spectra show vibrational coupling to the first electronic transition, indicating that the generation of mobile carriers in the solid involves molecular excitation schemes. The lowest energy transition is found to occur at photon energies of ∼1.8 eV. Below this energy, only weak and field-dependent photoresponse is observed. We attribute this to a tail of localized states related to defects in the film. The edge between localized and extended states approximately coincides with the first vibronic peak. From this peak we find the photoconduction edge of the film to be 1.81±0.01 eV at room temperature in the face-centered-cubic phase and 1.85±0.01 eV in the simple cubic phase below ∼200 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.112222
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Hydrogen concentration in chalcopyrite thin-film solar cells (2000)
    Springer
    Applied physics 70 (2000), S. 617-623 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 68.55.Ln; 73.50.Pz; 82.80.Ej
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A survey of the hydrogen concentration distribution in the various layers of chalcopyrite solar cells is presented. Depth profiles were measured by the nuclear reaction analysis method for the glass substrate, Mo back contact, Cu(In,Ga)S2 or Cu(In,Ga)Se2 absorber, CdS buffer, and ZnO window layer. We find that hydrogen is present in all layers in concentrations exceeding the solubility of hydrogen in the corresponding crystalline bulk materials. This indicates that the deposition process and the polycrystallinity of the layers favor the uptake of hydrogen. The measured concentrations range from some 1018 H/cm3 in the absorber up to some 1021 H/cm3 in the CdS buffer layer. Effects of annealing at elevated temperatures are reported.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050003
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Hydrogen and deuterium trapping at nitrogen in tantalum studied by PAC (1990)
    Springer
    Hyperfine interactions 60 (1990), S. 923-927 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract PAC experiments using181Hf as probe atom were performed in Ta samples containing 1.1 at% of N and loaded with 0.2 at% of H or of 1.6 at% of D. At room temperature only the known frequency due to N is present. Below 100K or 140K, for H and D respectively, the amplitude of this interaction decreases and two new interaction frequencies characterized by V0=240MHz, η=0.80 and V0=250 MHz, η=0.40 appear. These frequencies are attributed to H(D) trapped by N in the vicinity of the probe atom181Hf. The disappearance of these interactions at 100K and 140K is interpreted as a release of H (D) from Hf but not from N. From the data the jump rates of H(D) around N in Ta are derived.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02399902
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Local magnetism in superconducting YBa2Cu3O6+x (1991)
    Springer
    Hyperfine interactions 63 (1991), S. 147-153 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Oxygen-deficient YBa2Cu3O6+x samples were investigated by the muon spin rotation technique in zero external field. In an intermediate oxygen concentration region we find strongly relaxing μSR signals indicating the existence of internal magnetic fields. The strongly relaxing signals were observed only in samples with superconducting transition temperatures below 50 K. As an interpretation of the data we suggest that magnetic ordering and superconductivity coexist in these samples within regions of extensions of a few lattice constants, but not necessarily on the same sites.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395997
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    μSR study of RNi5 intermetallics where R=La, Gd or Tb (1991)
    Springer
    Hyperfine interactions 64 (1991), S. 389-394 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Zero-field μSR studies of some hexagonal intermetallic compounds are described. Our LaNI5 data provide information on the muon localisation site. This site could be one of the deuterium sites deduced from neutron diffraction. A comparison of the temperature dependence of the exponential damping rate, λ(T), of our samples shows that λ(T) is strongly influenced by crystal field effects. The TbNi5 spectra exhibit two components forT〈60 K. We discuss the possible explanations of this result. We see a μSR signal below the magnetic phase transition in GdNi5. This makes the study of the spin-lattice relaxation rate possible in the ordered magnetic state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396167
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Positive muon spectroscopy of R2Fe14B (1991)
    Springer
    Hyperfine interactions 64 (1991), S. 405-413 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Muon spin rotation (μSR) experiments were performed on polycrystalline samples of R2Fe14B in zero applied field. In all samples a single spin precession frequency was observed. In Nd2Fe14B and Ho2Fe14B pronounced anomalies showed up in the temperature dependence of the μSR frequencies at the spin reorientation temperatures of 150 K and 60 K, respectively. Our data can be explained with the assumption that only thec-axis component of the magnetization is sampled by the muon. We find a strong dependence of the local field on the magnetic moment of the rare earth ion. This is in accordance with calculations of the dipolar fields at the assumed muon stopping site.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02396170
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Muon spin rotation studies of local magnetism in magnetic and superconducting systems based on the highT c copper oxide structures (1990)
    Springer
    Hyperfine interactions 61 (1990), S. 1017-1033 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In the present paper we will review studies of local magnetism by the muon spin rotation technique in two classes of High-TC superconductors, namely La2-xSrxCuO4 and YBa2Cu3Ox. In addition we present some new results for the existence of local magnetism in hydrogen doped YBa2Cu3O7.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02407571
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    A muon spin rotation study of hydrogen in YBa2Cu3O y (1991)
    Springer
    Hyperfine interactions 63 (1991), S. 155-159 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Superconducting YBa2Cu3O y samples were doped with hydrogen and investigated by the muon spin rotation technique. For hydrogen concentrations above a thresholdx, which depends on the oxygen stoichiometry, we find a well defined precession signal in zero external field. This is a clear indication of magnetic ordering in these samples. In samples with a smaller hydrogen content no magnetic ordering was found. For these samples however, the depolarization rate σ(T→0) as measured in a transverse external field depends strongly on the hydrogen content. Our data are consistent with the assumption that hydrogen acts as an electron donor, filling the hole states in YBa2Cu3O y .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02395998
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Magnetism in hydrogenated YBa2Cu3O7 a comparison of μSR and NMR results (1994)
    Springer
    Hyperfine interactions 86 (1994), S. 609-614 
    Details
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Hydrogenated YBa2Cu3O7 with [H]/cell=2.0 was studied by X-ray diffraction, μSR and1H-NMR. For the first time, the hydride phase (16% larger c-axis) known from thin film experiments was seen in a bulk sample. A comparison of the μSR and NMR results shows that the 15 mT site (2 MHz in μSR) is the stable position for the proton and muon. The three other muon sites (4 MHz line and two exponentially decaying components) are metastable.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02068955
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    On the determination of the crystalline fraction of polyethylenes from X-ray diffractionCommunication No. 112. (1961)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 44 (1961), S. 24-36 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird gezeigt, daß die verschiedenen in der Literatur empfohlenen Verfahren zur Bestimmung des kristallinen Anteiles in Polyäthylenen auf röntgenographischem Wege zu übereinstimmenden Ergebnissen führen, wenn bestimmte Fehler, die von einigen der früheren Autoren gemacht worden sind, vermieden werden.Ein einfaches Verfahren wird angegeben, das den sonstigen umständlicheren nicht unterlegen ist, keine Korrektur für LORENTZ-Faktor, Polarisation und inkoherente Strahlung erfordert und sich leicht für einen Routinegebrauch anpassen läßt.Auf die Beobachtung einer engen Korrelation zwischen Kristallinität und Linienbreite der Kristallinen Interferenzen wird hingewiesen.
    Notes: It is demonstrated that the various procedures recommended in the literature for the determination of the crystalline fraction in polyethylene specimens by means of X-ray diffraction lead to consistent results if certain errors made by some of the previous authors are avoided.A simple procedure which is not inferior to other more elaborate ones and does not require corrections for LORENTZ factor, polarization or incoherent radiation is presented. It is easily adaptable for routine work.Attention is drawn to the observed close correlation between crystallinity and line width of the crystalline interferences.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1961.020440103
    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...