| | 1 | Author
| Yasumasa Tomita, Koji Yamada, Hiroshi Ohki, Tsutomu Okuda | Requires cookie* | | | Title
| Structure and Dynamics of Li 3 InBr 6 and NaInBr 4 by Means of Nuclear Magnetic Resonance  | | | | Abstract
| Li 3 InBr 6 and NaInBr 4 have been synthesized and characterized by means of DTA, 8 'Br NQR, 6 Li, 7 Li, 23 Na, and ll5 In NMR, and AC conductivity. These measurements revealed the presence of phase transitions and cationic diffusion in both compounds. From the spin-lattice relaxation times of 1 Br NQR and the peak widths of 7 Li and 23 Na NMR spectra, it is deduced that the conduction is due to cat-ionic diffusion. The activity energy for the Li + diffusion was found to be 24 kJ/mol for Li 3 InBr 6 . | | | |
Reference
| Z. Naturforsch. 53a, 466—472 (1998); received January 26 1998 | | | |
Published
| 1998 | | | |
Keywords
| NQR, NMR, Spin-lattice Relaxation Time, AC Conductivity, Cation Diffusion | | | |
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| default:Reihe_A/53/ZNA-1998-53a-0466.pdf | | | | Identifier
| ZNA-1998-53a-0466 | | | | Volume
| 53 | |
| 2 | Author
| Yasumasa Tomita, Hiroshi Ohki, Koji Yamada, Tsutomu Okuda | Requires 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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| default:Reihe_A/55/ZNA-2000-55a-0117.pdf | | | | Identifier
| ZNA-2000-55a-0117 | | | | Volume
| 55 | |
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