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2000 (1)
1Author    Yasumasa Tomita, Hiroshi Ohki, Koji Yamada, Tsutomu OkudaRequires cookie*
 Title    Dynamic Behavior of Group 13 Elements in Bromocomplexes as Studied by NQR and NMR  
 Abstract    NMR, NQR, powder X-ray diffraction, DTA and AC conductivity were measured in RMBr 4 (R = Ag, Cu; M = Al, Ga) and RMiBr 7 (R = Li, Ag; M = Al, Ga). In RMBr 4 , the activation energy of Cu + diffusion was evaluated from ^Cu NMR and was in good agreement with that from S1 Br NQR. In CuAlBr 4 , the e 2 Qq/h value of 63 Cu NMR and the 77 value of 27 AI NMR changed linearly with decreasing temperature, although the e 2 Qq/h value of 27 AI NMR did not change so much. These temperature dependences are supposed to be due to Cu + diffusion and not to a variation of the lattice constants. In RMiBr 7 , the activation energy was obtained from the spin-lattice relaxation time T x of 81 Br NQR and is ascribed to a modulation of the cation diffusion. The line width of 7 Li NMR in LiAl 2 Br 7 was about 5.9 kHz in the low-temperature phase and 0.4 kHz for the high-temperature phase. The 27 A1 NMR spectrum was broadened by the quadrupole interaction and unchanged up to 400 K, suggesting that diffusion of Li + ions occurs in the high-temperature phase. 
  Reference    Z. Naturforsch. 55a, 117—123 (2000); received August 25 1999 
  Published    2000 
  Keywords    T x of 81 Br NQR, 27 A1 NMR, 7 Li NMR, 63 Cu NMR, Cation Diffusion 
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 TEI-XML for    default:Reihe_A/55/ZNA-2000-55a-0117.pdf 
 Identifier    ZNA-2000-55a-0117 
 Volume    55