Abstract
In order to understand the catalytic properties of amorphous metallic alloys, knowledge of the surface structure is important. We have investigated amorphous Fe 91Zr 9 alloys which have been used as catalysts for ammonia synthesis. Scanning electron microscopy (SEM), scanning tunnelling microscopy (STM) and X-ray diffraction were used. SEM images show α-Fe crystallites on the surface of the catalyst used. With STM, hilly surfaces on a nanometer scale are observed. STM images show strong similarities between amorphous and reacted samples. We conclude that the surface of the as-received amorphous alloy is crystallized.
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