Segregation of Sn at the Au(110) surface and its effect on the 1x2 <-> 1x1 phase transition.
01 January 1987
The segregation os Sn to the (110) surface of a nominally pure Au crystal was observed by low energy electron diffraction, Auger electron spectroscopy and low energy ion scattering. Sn coverages up to 0.2 monolayers (ML) were produced by annealing above 675k. The heat of segregation was found to be 3.8 +- 0.4 kcal/mole. Surface Sn was shown to have a marked effect on the 1x2 -> 1x1 phase transition, e.g. Sn coverages of 0.002 ML and 0.13ML produced shifts to lower transition temperature of 15k and 200k, respectively.