NASA NTRS · 19640010892
Oxygen diffusion into refractory metals- niobium
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Barrett, C. A., Rosenblum, L.. 1964-01-01. Oxygen ''pumping efficiency'' of refractory metals. https://ntrs.nasa.gov/citations/19640010892
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The Group VIA-Re binary systems are characterized by the presence of several intermediate phases. The u phase is present in all of the systems, but the a-Mn phases occur in only the Mo-Re and W-Re systems. The occurrence of these intermediate phases appears to be governed largely by electronic factors and is predictable on the basis of electron/atom ratio. The thermionic work functions of the intermediate phase materials were experimentally determined. function and the screening of the outermost electrons in the Group VIA metals was found. A correlation between the work As might be expected for purely metallic substances, the work functions were relatively high, in the range 4. 5 to 5. 0 eV, and in each case were bracketed by the work functions of the pure constituents. A discontinuous change in the average work function with composition is proposed, based on a thermodynamical treatment of the electron vapor.
Electron emission models for evaluation of charge distribution and total energy of metal-gas interface, noting role of quantum mechanical corrections
Feasibility studies for growing refractory metal carbides single crystals from melts and liquid solutions