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1996 (1)
1Author    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