Abstract
Single-crystal tungsten substrates produced by electron-beam melting were cleaned by annealing in an oxygen atmosphere (∼10–3Pa, ≃1500°C) for a few hours to remove adsorbed carbon and by high-temperature ultrahigh-vacuum annealing (≃2 × 10–8Pa, ≥2500°C) for a few minutes to remove residual oxygen. The process was followed by low-energy ion scattering, Auger electron spectroscopy, and low-energy electron diffraction. The carbon and oxygen adsorbed on the surface of single-crystal tungsten were found to form ordered, oriented structures. The resultant high-purity, structurally perfect W substrates were used to study electron emission in the Ba/W and Re/W systems.
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Cortenraad, R., Ermolov, S.N., Denier van der Gon, A.W. et al. Cleaning Procedure for Single-Crystal Tungsten Substrates. Inorganic Materials 37, 673–677 (2001). https://doi.org/10.1023/A:1017617905380
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DOI: https://doi.org/10.1023/A:1017617905380