| 2 | 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 | |
3 | Author
| M. R., R., Haruo Niki, Shoichi Tomiyoshi, Takeshi Shinohara, Mamoru Omori, Tsuyoshi Kajitani, Hiroshi Kyan, Takeshi Hamagawa, Hirotaka Odahara, N.M R Proton, M. R. | Requires cookie* | | Title
| Hydrogen-doped Antiferromagnetic YBa2Cu30 7_ 5H x as Studied by Proton N  | | | Abstract
| of the C u(l) site have been measured on the antiferromagnetic phase of a powdered sample of hydrogen-doped tetragonal YBa2C u30 6 jHq 14 between 5 and 300 K. The line width, Aa>, of *H N M R increases abruptly below 20 K. The enhancement of T2_1 and that of Tj-1 of 63Cu (1) N Q R occurs around 20 K and 40 K, respectively. The nuclear magnetization does not recover in a simple exponential manner below 80 K. The predominant mechanism governing Tx below 80 K was found to be the fluctuating magnetic field which originates from the staggered C u2 + moments in either the C u(l) oxygen-deficient layer or the C u(2)02 plane induced by the hole doping effect. These enhancements and the abrupt increase in Aco are attributed to this fluctuating magnetic field. | | |
Reference
| Z. Naturforsch. 49a, 401—406 (1994); received August 12 1993 | | |
Published
| 1994 | | |
Keywords
| Antiferromagnetic materials, High-7^ superconductor, Spin-lattice relaxation time, Spin-spin relaxation time, Proton N | | |
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| default:Reihe_A/49/ZNA-1994-49a-0401.pdf | | | Identifier
| ZNA-1994-49a-0401 | | | Volume
| 49 | |
4 | Author
| Mineyuki Hattori, Yoshito Onoda, Tomoki Erata, M. E. Smith, Bruker Analytische, M. Esstechnik, G. M. Bh, Masakazu Hattori, Hiroshi Ohki, Ryuichi Ikeda | Requires cookie* | | Title
| Ionic motion and Disordered Structure in the Rotator Phase of Butylammonium Chloride Studied by Temperature Dependences of 35C1 and 2HNMR  | | | Abstract
| Temperature dependences o f 35C1 and 2H quadrupole coupling constants and 35C1 N M R spin-lat tice relaxation times in polycrystalline samples were measured in the rotator phase of the butylam m onium chlorides C 4H 9N H 3C1 and C4H 9N D 3C1, obtainable above the phase transition tempera ture o f 241 K. A rapid decrease o f the quadrupole coupling constants of both nuclei upon heating is attributed to increasing dynam ic disorder formed around the polar head. The presence of self-dif-fussion o f C P ions was revealed from the spin-spin relaxation time and resonance line-width in single crystals, and confirmed by measuring the dc electrical conductivity. | | |
Reference
| Z. Naturforsch. 49a, 291 (1994); received July 23 1993 | | |
Published
| 1994 | | |
Keywords
| Solid N M R, Quadrupole coupling constant, Spin-lattice relaxation time, Self-diffusion, Rotator phase | | |
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| default:Reihe_A/49/ZNA-1994-49a-0291.pdf | | | Identifier
| ZNA-1994-49a-0291 | | | Volume
| 49 | |
5 | Author
| Haruo Niki, Kikuhiro Kano, Mitsuhiro Takase, Kensei Majikina, Katsuma Yagasaki, Takeshi Shinohara, Mamoru Omori, Shoichi Tomiyoshi, Etsuo Akiba | Requires cookie* | | Title
| Oxygen Content Dependence of 63 Cu(l) NQR and Proton NMR in Hydrogen-Doped Antiferromagnetic YBa 2 Cu 3 0 6+A: H y  | | | Abstract
| The oxygen content dependence of 63 Cu NQR at the Cu(l) site and proton NMR have been meas-ured in the antiferromagnetic phase of powdered samples of hydrogen-doped YBa 2 Cu 3 0 6+x .H v (0.07 < JC < 0.17 and y » 1) from 4.2 to 90 K. The spectrum of 1 H NMR is a single line and the line width increases below 15 Kdue to magnetic interactions. The enhancements of Tf 1 and 7^ 1 of 63 Cu(l)NQR occur around 35 and 15 K, respectively. These enhancements increase with increasing oxygen concen-tration. The maximum values of Tf 1 and T^ for the sample with x = 0.17 reach 200 sec -1 and more than 7 msec -1 , respectively. The predominant source for the relaxation mechanism of 63 Cu(l) NQR and the line broadening of 'H NMR are found to be the fluctuating magnetic field due to the staggered Cu 2+ moments. | | |
Reference
| Z. Naturforsch. 53a, 518—523 (1998); received March 24 1998 | | |
Published
| 1998 | | |
Keywords
| Antiferromagnetic materials, High-T^ superconductor, Spin-lattice Relaxation Time, Cu NQR, Proton NMR | | |
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| default:Reihe_A/53/ZNA-1998-53a-0518.pdf | | | Identifier
| ZNA-1998-53a-0518 | | | Volume
| 53 | |
6 | Author
| K. P. Ramesh, J. Ramakrishna, K. S. Suresh, C.Raghavendra Rao | Requires cookie* | | Title
| Pressure Dependence of the Chlorine NQR in Chloro Pyridines  | | | Abstract
| The "CI NQR frequency (VQ) and spin lattice relaxation time) in 2,6-dichloropyridine, 2 amino 3,5-dichloropyridine and 6 chloro 2-pyridinol have been measured as a function of pressure up to 5.1 kbar at 300 K, and the data have been analysed to estimate the temperature coefficients of the NQR frequency at constant volume. All the three compounds show a non linear variation of the NQR frequen-cy with pressure which can be described by a 2 nd order polynomial in pressure. The rate of change of the NQR frequency with pressure is positive and decreases with increasing pressure. The spin lattice re-laxation time 7, in all the three compounds shows a small increase with pressure, indicating that the re-laxation is mainly due to the torsional motions. | | |
Reference
| Z. Naturforsch. 55a, 111—116 (2000); received August 25 1999 | | |
Published
| 2000 | | |
Keywords
| Chlorine NQR, Spin-Lattice Relaxation Time, Pressure Dependence, 2,6 dichloropyridine, 2-amino 3,5-dichloropyrine, 6-chloro 2-pyridinol | | |
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| default:Reihe_A/55/ZNA-2000-55a-0111.pdf | | | Identifier
| ZNA-2000-55a-0111 | | | Volume
| 55 | |
7 | Author
| K. S. Suresh3, K. P. Rameshb, C. Raghavendra Rao3, J. Ramakrishnab | Requires cookie* | | Title
| Pressure Dependence of the Chlorine NQR in Three Solid Chloro Anisoles  | | | Abstract
| The 35C1 Nuclear Quadrupole Resonance (NQR) frequency (V q) and spin lattice relaxation time (T{) in the three anisoles 2,3,4-trichloroanisole, 2,3,6-trichloroanisole and 3,5-dichloroanisole have been measured as a function of pressure upto 5.1 kbar at 300 K, and the data have been analysed to estimate the temperature coefficients of the NQR frequency at constant volume. All the three com pounds show a non linear variation of the NQR frequency with pressure, the rate of which is positive and decreases with increasing pressure. In case of 3,5-dichloroanisole the value becomes negative in the higher range of pressure studied. The spin lattice relaxation time T{ in all the three compounds shows a weak dependence on pressure, indicating that the relaxation is mainly due to the torsional motions. | | |
Reference
| Z. Naturforsch. 56a, 764—772 (2001); received July 19 2001 | | |
Published
| 2001 | | |
Keywords
| NQR, 35C1, Frequency, Spin-lattice Relaxation Time, Torsional Motion, Pressure and Temperature Dependence, 3,5-dichloroanisole, 2,3,4-trichloroanisole, 2,3,6-trichloroan isole | | |
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| default:Reihe_A/56/ZNA-2001-56a-0764.pdf | | | Identifier
| ZNA-2001-56a-0764 | | | Volume
| 56 | |
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