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1998 (1)
1Author    F. Köksal, F. UcunRequires cookie*
 Title    EPR of 0 2 " Radicals in the Zeolites NH 4 NaY and NH 4 CaA  
 Abstract    Activated and non-activated states of the zeolites NH 4 NaY and NH 4 CaA, and their NH 4 forms were prepared with an (NH 4) 2 S0 4 solution and were investigated by EPR after 7-irradiation. The formed radicals were attributed to O-T supposed to be trapped near a trigonally coordinated framework of 27 A1 (I = 5/2). Anisotropic O^" spectra were observed, consisting of hyperfine structure due to the 27 Al framework, even at room temperature. This was attributed to the scarceness of NH 4 sites or trap sites because of the preparation of the NH 4 forms of the zeolites with an (NH 4) 2 S0 4 solution. The crystal field splittings were found and interpreted. 
  Reference    Z. Naturforsch. 53a, 951—954 (1998); received October 28 1998 
  Published    1998 
  Keywords    EPR, Zeolites, 0~, NH 4 NaY, NH 4 CaA 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0951.pdf 
 Identifier    ZNA-1998-53a-0951 
 Volume    53