| | 1 | 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 | | | |
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| default:Reihe_A/51/ZNA-1996-51a-0242.pdf | | | | Identifier
| ZNA-1996-51a-0242 | | | | Volume
| 51 | |
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