| Abstract: | The initial phases of high temperature (1700 K) carburization of (110) molybdenum surfaces by C6H6 at low pressure are examined with low energy electron diffraction (LEED) and emission electron microscopy. After an exposition of about 8 · 10−5 Torr · sec a (4 × 4) superstructure was observed by means of LEED, interpreted as coincidence lattices with the Mo2C (10.0) plane parallel to the Mo (110) surface. Heating a sample without further exposition resulted in the appearance of a complex and of a (2 × 2) superstructures. After an exposition of about 2 … 9 · 10−3 Torr · sec needle shaped molybdenum carbide crystallites grew on the surface into the 111] and 111] directions. The orientation Mo2C (10.1) parallel to Mo (110) was concluded from the LEED patterns. |
