Abstract
The system Hf/W(011) was investigated using the STM, LEED, AES and CPD techniques. For low coverages (about 1 ML), dissolution of Hf in W and alloying on the W(011) surface was observed. For temperatures above 1200 K, mixing of the adsorbate and substrate atoms was observed. This process occurred at the edges of atomic steps. A surface alloy appeared at a temperature in excess of 1500 K. The alloy was being formed as large islands occupying one terrace each, and separated by atomic step bunchings of the substrate. At 1850 K the surface alloy decayed. The decay was followed by solution of the Hf in the subsurface layer of substrate.
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