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1983
Journal Article
Titel
Nuclear magnetic resonance of atomic motions in vanadium.
Alternative
Untersuchung atomarer Bewegungen in Vanadium mit der kernmagnetischen Resonanz
Abstract
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.