Study of diffusion of oxygen in dilute vanadium alloys using solid electrolytic cells
Conference
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OSTI ID:6832006
The bulk diffusivity of oxygen has been measured as a function of temperature in dilute vanadium alloys. The emf vs time is measured on the electrolytic cell: Pt/Nb+NbO/ThO/sub 2/-7%Y/sub 2/O/sub 3//V-alloy/Zr/Pt. The oxygen content, which is initially uniform in the vanadium-based alloy, drains into the zirconium sink as a function of annealing time. After a short transient, the rate of cell emf change is directly proportional to the diffusivity of oxygen in the alloy. Substitutional solutes in vanadium have been chosen on the basis of their atomic sizes in vanadium and the heats of formation of their oxides. Oxygen diffusion results have been obtained for nickel, chromium, niobium, tantalum, titanium, zirconium and hafnium as binary solute additions of up to 4 at. %. The oxygen diffusivity results are compared with those for niobium-based alloys. Interpretations of the results are made using two models for the thermodynamics and kinetics of trapping of interstitial atoms by substitutional solute atoms.
- Research Organization:
- Illinois Univ., Urbana (USA)
- DOE Contract Number:
- AC02-76ER01198
- OSTI ID:
- 6832006
- Report Number(s):
- DOE/ER/01198-1343; CONF-810203-9
- Country of Publication:
- United States
- Language:
- English
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