Initial Stage of Ni Growth on the Mo(110) Surface

概要

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Surface structures of Ni adsorbed on the Mo(110) surface have been studied using reflection high energy electron diffraction (RHEED). The surface phase diagram of Ni on the Mo(110) surface for annealing temperature vs Ni coverage has been completed. Both a two-dimensional layer and three-dimensional islands were observed in a thickness region of more than 1 ML (1 ML = 2.0 A^°) and at annealing temperatures between 650℃ and 850℃ showing the Nishiyama-Wassermann orientation relationship on the Mo(110) substrate. The structure of the two-dimensional layer has a unit mesh of the distorted Ni(111) plane which is expanded by 0.9% in the [01^^-1]_<Ni> direction and by 3% in the [11^^-2]_Ni direction. The three-dimensional islands observed in the coverage of less than 15 ML have an atomic arrangement with a nearly six-fold symmetric structure of the distorted Ni(111) layer which is expanded uniformly by 3%. Both the layer and islands are commensurate with the Mo(110) lattice to form long-range-ordered structures.
社団法人応用物理学会の論文
1999-05-15