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1999 (1)
1990 (1)
1Author    Jorma HölsäRequires cookie*
 Title    Parametrization of Crystal Field Splittings of the 7 F 7 Levels in Eu 3+ Doped Tetragonal Rare Earth Oxyhydroxides, REOOH:EU 3+ (RE = Y and Lu)  
 Abstract    The luminescence spectra of europium (3 +) doped rare earth oxyhydroxides, REOOH :Eu 3 + (RE = Y and Lu), were studied and analyzed at 77 and 300 K under UV and dye laser excitation. The observed 7 F 0 _ 4 level schemes were simulated with the aid of the phenomenological crystal field theory. The descending symmetry method from C 2v to C s symmetry was used in the simulation. Good results were obtained with C s symmetry simulation which yielded r.m.s. deviations of 6 and 7 cm -1 between the calculated and experimental 7 F 0 _ 4 level schemes for YOOH:Eu 3+ and LUOOH:EU 3+ , respectively. The C 2v simulation was found inadequate to describe the experimental energy level schemes. The even rank crystal field parameters vary only slightly as a function of the host. Comparison with the corresponding values obtained for the monoclinic form of the Eu 3 + doped RE oxyhydroxides reveals significant differences. 
  Reference    Z. Naturforsch. 45a, 173—178 (1990); received October 23 1989 
  Published    1990 
  Keywords    Crystal field, Europium, Rare earth oxyhydroxides 
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 TEI-XML for    default:Reihe_A/45/ZNA-1990-45a-0173.pdf 
 Identifier    ZNA-1990-45a-0173 
 Volume    45 
2Author    F. Köksal, İ. Kartal, B. KarabulutRequires cookie*
 Title    Electron Paramagnetic Resonance of Cu 2+ in KHC0 3 Single Crystals  
 Abstract    The electron paramagnetic resonance spectra of Cu 2+ doped KHC0 3 single crystals were studied at room temperature. The results indicate a substitutional entrance of the Cu 2+ ions in place of the magnetically inequivalent K + sites. The charge compensation is supposed to be fulfilled by proton vacancies. The hyperfine lines were well resolved and the 65 Cu hyperfine coupling tensors were also found. The ground state of Cu 2+ indicates the dominance of the d x i_ y 2 orbital and, therefore, elongation of the polyhedron, similar to a lengthened octahedron. 
  Reference    Z. Naturforsch. 54a, 177—179 (1999); received January 9 1999 
  Published    1999 
  Keywords    EPR, Cu 2+, Potassium Bicarbonate, Crystal Field, Substitution, Impurity 
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 TEI-XML for    default:Reihe_A/54/ZNA-1999-54a-0177.pdf 
 Identifier    ZNA-1999-54a-0177 
 Volume    54