Surface alloying of thin beryllium films on tungsten

Details Surface alloying of thin beryllium films on tungsten Surface alloying of thin beryllium films on tungsten

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006njph....8..181w&link_type=abstract

New Journal of Physics, Volume 8, Issue 9, pp. 181 (2006).

Physics

10

Scientific paper

The bimetallic system Be W is studied after room temperature deposition of Be films on W and annealing experiments up to 1070 K using x-ray photoelectron spectroscopy (XPS). Already at room temperature an intermixing at the interface occurs. The amount of intermetallic compound increases during the annealing experiments, but is limited to ~1.2 nm. The surface alloy formation is clearly visible as a binding energy (BE) shift of both core levels Be 1s and W 4f, and in the valence band (VB) region. The surface alloy is stable and the remaining layer thickness is independent of the initial Be layer thickness. Using a combination of sputter depth profiling before and after annealing and Monte Carlo simulation of the sputter process (TRIDYN) the depth scale of Be W inter-diffusion is determined.

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