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1Author    F. Köksal, İ. Kartal, A. GençtenRequires cookie*
 Title    Electron Paramagnetic Resonance of Cu 2+ Doped Na 2 HAs0 4 -7H 2 0 Single Crystals  
 Abstract    The electron paramagnetic resonance spectra of Cu 2+ doped Na 2 HAs0 4 -7H 2 0 single crystals were studied at room temperature. The results indicate the substitutional entrance of Cu 2+ in two magnetically inequivalent Na + sites. Charge compensation is supposed to be fulfilled by proton vacancies. The spin Hamiltonian parameters were determined. The ground state for Cu 2+ seems to indicate the dominance of the d z 2 orbital and therefore a compression of the distorted octahedron along its C 4v axis. 
  Reference    Z. Naturforsch. 53a, 779—782 (1998); received May 5 1998 
  Published    1998 
  Keywords    EPR, Cu 2+, Sodium Hydrogen Arsenate 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0779.pdf 
 Identifier    ZNA-1998-53a-0779 
 Volume    53 
2Author    Fevzi Köksal, Fatih Ucun, İbrahim KartalRequires cookie*
 Title    EPR Study of Cr 5 + and Cu 2 + in Some Zeolites Introduced by Solid-and Liquid-State Reactions  
 Abstract    This study reports on the EPR of Cr 5+ and Cu 2+ ions, introduced by solid-and liquid-state reactions with the synthetic zeolites 3A, 4A and 5A, and the natural zeolite clinoptilolite. Cr 3+ was oxidized to Cr 5 + in the samples, the coordination around Cr 5 + being square pyramidal. Super-hyperfine (shf) interaction of Cr with 27 A1 nucleus was observed in both solid-and liquid-state-introduced 5A zeolite, whereas this shf could not be observed for the solid-state introduced 4A zeolite. The liquid-state Cr-introduced 4A zeolite needed a heat treatment at 473 K for Vi h for the appearance of shfs. Furthermore, it has been found that the coordination structure around the Cu 2 + is square pyramidal in solid-state introduced samples, whereas it is octahedral in the liquid-state introduced ones. 
  Reference    Z. Naturforsch. 51a, 242—244 (1996); received January 8 1996 
  Published    1996 
  Keywords    EPR, Cu 2 +, Cr 5 +, Zeolites, Ion introduction 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0242.pdf 
 Identifier    ZNA-1996-51a-0242 
 Volume    51 
3Author    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 
4Author    İ. Kartal, B. Karabulut, F. Köksal, H. İçbudakRequires cookie*
 Title    EPR Studies of Cu 2+ Doped Zinc Saccharin, [Zn(sac) 2 (H 2 0) 4 ]-2H 2 0 Single Crystals  
 Abstract    The EPR spectra of Cu 2+ in zinc saccharin crystalline powder and single crystals have been recorded at room temperature. The angular variation of the spectra indicates the substitution of the host Zn 2+ with Cu 2+ . Two magnetically inequivalent sites for Cu 2+ have been observed. The spectra were fitted with a rhombic spin-Hamiltonian, and the ground state wave function of the complex has been constructed. 
  Reference    Z. Naturforsch. 55a, 887—890 (2000); received October 13 2000 
  Published    2000 
  Keywords    EPR, Zinc Saccharin, Cu 2+, Ground State Wave Function 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0887.pdf 
 Identifier    ZNA-2000-55a-0887 
 Volume    55