It was noted that the structure of the (00•1) surface of the α-phase varied as a function of the annealing temperature. At least 3 phases were detected by means of low-energy electron diffraction. A well-ordered (√3 x √3)R30º structure was observed at annealing temperatures below 960K, and was seen as a honeycomb structure by scanning tunnelling microscopy. A model was proposed for the C-terminated structure, where the C atoms were located in the 3-fold hollow sites of a Mo layer, and each C atom was seen as a depression of the honeycomb structure by using scanning tunnelling microscopy. An increase in the C coverage of the surface transformed the (v3 x v3)R30º structure into a c(2 x 4) structure in which zig-zag rows, running parallel to each other, were observed by means of scanning tunnelling microscopy.

C-Terminated Reconstruction and C-Chain Structure on Mo2C(0001) Surface Studied by Low Energy Electron Diffraction and Scanning Tunnelling Microscopy. R.L.Lo, K.Fukui, S.Otani, S.T.Oyama, Y.Iwasawa: Japanese Journal of Applied Physics - 1, 1999, 38[6B], 3813-5