Nuclear Magnetic Resonance in the Vanadium-Hydrogen System

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概要

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• The nuclear magnetic resonance of both vanadium and proton in the vanadium-hydrogen system has been studied as a function of hydrogen concentration and temperature. Oriani et al. already reported the Knight shifts of both vanadium and proton, but only at one concentration of 0.66H/V and at room temperature. The present authors have tried to observe over wider range of concentrations and temperatures, i.e., from pure vanadium to O.5H/V and from room temperature to abov 150℃. The observations were made with a spectrometer being operated at 12.05Mc/sec for vanadium and at 31.00Mc/sec for proton. The samples used were powders of 270 mesh. According to Zanowick et al. the vanadium hydrogen system consists of two phases, namely, a hydrogen-poor bcc phase α and a hydrogen-rich bct phase β, at compositions between pure V and V_2H at room temperature, but the system is of a single phase above 15O℃. The Knight shift of V^<51> in the α phase observed at high temperatures is shown in the figure as a function of concentration of hydrogen, H/V, or excess electron concentration per vanadium atom. The Knight shift of V^<51> turned out to be apparently independent of temperatures at all concentrations. If we plot in the same figure the Knight shift of V^<51> observed by Drain in the vanadium-chromium solid solution as a function of excess electron per vanadium atom, we find the fact that both results can be arranged on a single curve. Also included in the figure is the value observed bv Oriani et al. with VH_<0.66> in the β phase, which deviates appreciably from that of the V-Cr system but seems to lie on a curve extrapolated from the present data. The shift of proton resonance of all samples is negative and is of the order of a few parts in 10^5 at room temperature. As the shift of proton resonance due to the skin eggect turns out to be the mainpart of the observed shift, we have to conclude that the real shift of proton resonance should be less than a part in 10^5. this result is in marked contrast with the shft of -O.009_5% reported by 0riani et al. VH_<0.66> in the β phase.

• 社団法人日本物理学会の論文
• 1964-06-05

著者

• BETSUYAKU Hiroshi

  Japan Atomic Energy Research Institute

• TAKAGI Yutaka

  Japan Atomic Energy Research Institute

• Betsuyaku Yasuko

  Department Of Physics Ibaraki University

• Betsuyaku Hiroshi

  Japan Atomic Energy Research Insutitute Tokai-mura

• Takagi Yutaka

  Japan Atomic Energy Research Insutitute Tokai-mura

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