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1998 (1)
1996 (1)
1Author    Mutsuo Igarashi, Noriaki Okubo, Ryozo YoshizakiRequires cookie*
 Title    Na Nuclear Spin-Lattice Relaxation in Dehydrated Zeolite NaY  
 Abstract    The spin-lattice relaxation time T\ of 2, Na-NMR in dehydrated zeolite NaY has been measured from 26 to 300 K. The magnetization recovery curve is not single-exponential at all measured temperatures and 1 increases in proportion to the square of temperature above 200 K. The result is analyzed with a theory of the Raman process based on covalency. The value of T\ is compared with that of NaX in which the concentration of Na is about 2 times larger than in NaY. 
  Reference    Z. Naturforsch. 53a, 442—446 (1998); received December 30 1997 
  Published    1998 
  Keywords    Dehydrated Zeolite NaY, 23 Na-NMR, T\ \ Raman Process, Phonon Spectrum 
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 TEI-XML for    default:Reihe_A/53/ZNA-1998-53a-0442.pdf 
 Identifier    ZNA-1998-53a-0442 
 Volume    53 
2Author    Mutsuo Igarashi, Noriaki Okubo, Shuichi Hashimoto, Ryozo Yoshizaki, DeokJoon ChaRequires cookie*
 Title    Na Spin-Lattice Relaxation Measurements in Dehydrated Na-X Zeolite  
 Abstract    The spin-lattice relaxation time T\ of 23 Na-NMR in a dehydrated Na-X zeolite has been measured from 20 to 300 K. The recovery curve is not single-exponential at all measured temperatures and T\~ 1 increases with the square of temperature around room temperature. The results are analyzed by assuming non-equivalent sites and by applying the theory of the Raman process based on covalency. 
  Reference    Z. Naturforsch. 51a, 657—661 (1996); received October 17 1995 
  Published    1996 
  Keywords    Dehydrated Na-X zeolite, 23 Na-NMR, spin-lattice relaxation, Raman process, nonequivalent sites 
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 TEI-XML for    default:Reihe_A/51/ZNA-1996-51a-0657.pdf 
 Identifier    ZNA-1996-51a-0657 
 Volume    51