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Nuclear magnetic resonance of atomic motions in vanadium.

Untersuchung atomarer Bewegungen in Vanadium mit der kernmagnetischen Resonanz
: Kanert, O.; Guenther, B.

Acta Metallurgica 31 (1983), No.6, pp.909-917 : Abb.,Lit.
ISSN: 0001-6160
Journal Article
Fraunhofer IFAM ()
diffusion; Fremddiffusion; Kernresonanz; Kernspinrelaxation; NMR; Sauerstoff; Selbstdiffusion; vanadium

Atomic motions in solid vanadium have been investigated by means of NMR. For that purpose, the Zeeman spin-lattice relaxation time, the rotating-frame spin-lattice relaxation time, and the Knight shift of V in polycrystalline vanadium have been measured as a function of temperature in the range between 300 and 2000 K. At all temperatures, the relaxation time is mainly determined by electronic contributions leading to a temperature-dependent expression. In contrast to the data, two pronounced peaks in the relaxation rate at about 750 and 1600 K, respectively, are observed. The peak at 750 K arises from fluctuations in the nuclear quadrupolar interaction between vanadium and interstitially migrating oxygen whereas the maximum at 1600 K is caused by fluctuation in the nuclear dipole interaction due to atomic self-diffusion. From the low-temperature data, the diffusivity of oxygen is determined.