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'63 Cu NMR' in keywords
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2000 (1)
1993 (1)
1Author    H. Ohki, K. Harazono, T. Erata, A. Tasaki, R. IkedaRequires cookie*
 Title    Ionic Diffusion in Cu 6 PS 5 Br Studied by 63 Cu NMR  
 Abstract    Applying 63 Cu NMR technique, we observed exchange between the nonequivalent copper sites in crystalline Cu 6 PS 5 Br, known as a member of the mineral "argyrodite". Below 200 K, where the motion of the copper (I) ion is slow, we could distinguish several nonequivalent copper sites. On increasing the temperature, the chemical exchange between the nonequivalent cation sites was seen on the "Cu NMR spectra. We could determine the activation energy for this motion to be 35 kJ mol -1 , in good agreement with the published ionic conductivity. 
  Reference    Z. Naturforsch. 48a, 1005—1008 (1993); received July 13 1993 
  Published    1993 
  Keywords    Ionic conductor, 63 Cu NMR, Quadrupole interaction 
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 TEI-XML for    default:Reihe_A/48/ZNA-1993-48a-1005.pdf 
 Identifier    ZNA-1993-48a-1005 
 Volume    48 
2Author    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