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The segregation of nitrogen, phosphorus, sulphur and carbon in iron causes the formation of Fe X X bonds on the surface. The system metal (Fe(111),Mo(100))-carbon has been studied using the AES method. The bonds Fe C observed for lower surface coverages were transformed to Fe C C bonds for higher coverages and the interaction between iron atoms and carbon atoms decreased. In the case of molybdenum...
The carbon segregation at the Mo 0.75 Re 0.25 (100) surface was investigated by means of AES and quantitative LEED structure determination. The equilibrium surface carbon concentration is found to be a function of the bulk concentration and the annealing temperature. With increasing surface carbon concentration four different phases have been observed:...
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