ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

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
  • 61.70  (2)
  • 76.30.Fc  (1)
  • Jahn–Teller effect  (1)
  • PACS: 81.10.Fq; 81.30.Dz; 42.70.Nq  (1)
Collection
Keywords
Publisher
Years
  • 1
    Electronic Resource
    Electronic Resource
    ODMR and EPR investigations of Fe centers in KTaO3 (1996)
    Springer
    Applied physics 63 (1996), S. 331-337 
    Details
    ISSN: 1432-0649
    Keywords: 76.30.Fc ; 76.70.Hb ; 78.20.Ls
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The analysis of EPR spectra obtained from iron doped KTaO3 crystals in the as-grown state revealed three dominant iron centers: Fe3+-OI, axial Fe-centers with spinS = 3/2 and rhombic Fe3+. By comparison with data from literature possible assignments for the center withS = 3/2 are discussed. For the rhombic species the temperature dependence of the main parameters of the Spin- Hamiltonian was measured. The result makes it most plausible that only one rhombic iron center exists in KTaO3, in contrast with literature. The understanding of the EPR spectra allows us to assign transitions, observed at very low magnetic fields by optically detected magnetic resonance (ODMR), to this rhombic Fe center. On this basis, the magnetic circular dichroism (MCD) of this defect could be identified using the method of tagged-MCD. This spectrum is compared to the tagged-MCD of Fe3+-O1 and of axial Fe4+ centers, which may be generated metastably by optical charge transfer. Considerably different structures in the MCD spectra of both Fe3+ centers indicate different local surroundings and electronic states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01828735
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Growth and dielectric properties of congruently melting Ba1-xCaxTiO3 crystals (1997)
    Springer
    Applied physics 65 (1997), S. 301-305 
    Details
    ISSN: 1432-0630
    Keywords: PACS: 81.10.Fq; 81.30.Dz; 42.70.Nq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: 3 –CaTiO3 is investigated with regard to a congruently melting composition. The liquidus curve is determined from x=0.0 to 0.3, where x is the mole fraction of CaTiO3. It shows a minimum melting point near x=0.23. Ba1-xCaxTiO3 crystals are grown by the Czochralski technique from melts close to this composition. X-ray fluorescence analyses of the crystals indicate a congruently melting composition at x=0.227, corresponding to the observed minimum melting point. At the growth temperature the crystals possess a cubic perovskite-type structure. They undergo a structure change to the ferroelectric tetragonal phase at 98±3 °C, indicated by a sharp peak of the dielectric constant. Down to -120 °C no further phase transition is observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003390050583
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Photorefractive properties of ruthenium-doped potassium niobate (1994)
    Springer
    Applied physics 59 (1994), S. 563-567 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Photoconductivities and photovoltaic currents of ruthenium-doped KNbO3 are orders of magnitude larger than that of undoped and ion-doped crystals. KNbO3:Ru is very sensitive for holographic recording with red light and the photovoltaic current increases sublinearly with light intensity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00331912
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Photoconductivity and light-induced absorption in KNbO3:Fe (1991)
    Springer
    Applied physics 53 (1991), S. 81-86 
    Details
    ISSN: 1432-0630
    Keywords: 61.70 ; 72.40 ; 78.20
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Measurements of photoconductivity and light-induced absorption in KNbO3: Fe are performed at different light intensities and crystal temperatures. The results are interpreted in terms of a two-center charge transport model. Different model parameters may be evaluated from the experimental data. A complete set of parameters is suggested explaining the dependences of photoconductivity and light-induced absorption on light intensity and temperature for the KNbO3: Fe crystal investigated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00323439
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Ti3+ Jahn–Teller Polarons and Bipolarons in BaTiO3 (1999)
    Springer
    Journal of superconductivity 12 (1999), S. 193-195 
    Details
    ISSN: 1572-9605
    Keywords: Jahn–Teller effect ; polaron ; Anderson localization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract In high quality BaTiO3 crystals without trapping defects conduction electrons form Ti3+ polarons, their stabilization energy being caused by a Jahn–Teller effect. Depending on locally fluctuating potentials, tunable by uniaxial stress, small, intermediate, and banding electrons are identified by EPR. There are indications that also bipolarons are present.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1007731316635
    Location Call Number Expected 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...