| | 1 | Author
| F. Köksal, İ. Kartal, A. Gençten | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_A/53/ZNA-1998-53a-0779.pdf | | | | Identifier
| ZNA-1998-53a-0779 | | | | Volume
| 53 | |
| 2 | Author
| Fevzi Köksal, Fatih Ucun, İbrahim Kartal | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_A/51/ZNA-1996-51a-0242.pdf | | | | Identifier
| ZNA-1996-51a-0242 | | | | Volume
| 51 | |
| 3 | Author
| F. Köksal, İ. Kartal, B. Karabulut | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_A/54/ZNA-1999-54a-0177.pdf | | | | Identifier
| ZNA-1999-54a-0177 | | | | Volume
| 54 | |
|
