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  • 61.70  (2)
  • 76.30.Da  (1)
  • Jahn–Teller effect  (1)
  • PACS: 81.10.Fq; 81.30.Dz; 42.70.Nq  (1)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    Light-induced charge transport in BaTiO3 via three charge states of rhodium (1995)
    Springer
    Applied physics 61 (1995), S. 1-7 
    Details
    ISSN: 1432-0649
    Keywords: 71.55 ; 76.30.Da ; 78.50
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract By combined studies of electron spin resonance and optical absorption at low temperatures, the charge-transfer bands of Rh5+ and Rh4+ are identified to be peaked near 1.6 and 1.9 eV, respectively. On this basis, the light-induced charge-transfer processes in BaTiO3:Rh are unraveled at room temperature. It is shown that three charge states of Rh are involved, leading to two levels: the shallow Rh4+/5+ and the deeper Rh3+/4+ level. The optical behaviour of these two levels corresponds to those expected from a ‘two-center’ model. The present paper represents the first atomic-scale identification of three charge states of one element leading to optical ‘two-level’ response.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01090965
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    Paper (German National Licenses)
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  • 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
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  • 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
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  • 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
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  • 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
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