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  • 1980-1984  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 29 (1982), S. 1-7 
    ISSN: 1432-0630
    Keywords: 76.80.+y ; 71.55.−i ; 71.70.−d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Mössbauer spectra of LiNbO3: Fe(III)-monocrystals in external magnetic fields of 0.3−7T with various configurations of the γ-direction, c-axis of the crystal, and the magnetic field direction are interpreted by means of a spin Hamiltonian. A consistent set of hyperfine and crystal-field parameters could be least squares fitted for all spectra. Arguments that Fe(III) substitutes Nb(V) are given.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hyperfine interactions 16 (1983), S. 837-840 
    ISSN: 1572-9540
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Lithium niobate monocrystals exhibit many interesting physical phenomena such as ferro-, piezo- and pyroelectricity, low acoustical losses, small optical absorption in the visible region and, especialy after doping with small amounts of transition metal ions, strong photorefraction and photovoltaic effects [1–3]. According to the multitude of the properties there are numerous applications of LiNbO3 for e.g. light modulation, Q-switch, second harmonic generation, fibre optics, acoustic transducers, pyroelectric detectors and holographic data storage. In order to understand in detail the microscopic mechanisms of the bulk photovoltaic effect and the photorefraction, which are strongly enhanced by doping the crystals with iron, an exact knowledge of the not yet unambigously known lattice site and the charge compensation [4,5] as well as the electronic structure of the iron impurities is indispensable. Here the Mössbauer investigation of the hyperfine interaction of57Fe ions probing the crystal field may contribute to clarification. As can be seen from the isomer shift iron enters the LiNbO3-lattice as Fe(II) or Fe(III) [5]. By annealing the samples in oxydizing atmospheres (e.g. ≈p24 hours in air ≈p600
    Type of Medium: Electronic Resource
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