✍ Scribed by M Göthelid; S Haglund; J Ågren
No coin nor oath required. For personal study only.
The influence of oxygen on the sintering behavior of WC-Co has been investigated by Auger electron spectroscopy (AES) and scanning tunneling microscopy (STM). Deposition of Co on the WC(0001) surface and subsequent annealing at 650°C results in a 2ϫ2 reconstructed pre-cursor layer on top of which Co grows in weakly bound islands which can be moved on the surface by the STM tip. Annealing at 850°C removes excess Co and leaves only the 2ϫ2 surface. Oxygen exposure of the 2ϫ2 surface results in a "clustered" cobalt oxide overlayer which on annealing at 750°C breaks up and restores the 2ϫ2 structure as the metallic Co wets the surface.
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