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 Title: Nucleation and Growth of Order in Cu(3)Au (111) Films Author(s): Bonham, Scott William Doctoral Committee Chair(s): C. Peter Flynn Department / Program: Physics Discipline: Physics Degree Granting Institution: University of Illinois at Urbana-Champaign Degree: Ph.D. Genre: Dissertation Subject(s): Engineering, Materials Science Abstract: During epitaxial growth of (111) face-centered cubic crystal films, such as disordered $\rm Cu\sb3Au,$ there are two possible ways that successive layers can be laid down, leading to two types of stacking domains. However, a small vicinal miscut $(0.5\sp\circ {-}1\sp\circ )$ of the crystal surface introduces step edges that change nucleation preferences of the domains, resulting in one being preferred over the other by ratios up to 700:1. Fifteen samples were measured and this preference has been found to depend systematically and strongly on the magnitude and direction of the sample miscut. A qualitative RHEED study confirms that a preference for one of the stacking senses is present after deposition of a few monlolayers of $\rm Cu\sb3Au.$ The observed behavior of the film can be explained by a model in which Cu and Au atoms minimize their number of Nb nearest neighbors when growing over the Nb step edges. This represents both a discovery of a new phenomena in epitaxial nucleation and a technique for the production of improved epitaxial films. Issue Date: 1997 Type: Text Language: English Description: 116 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1997. URI: http://hdl.handle.net/2142/80643 Other Identifier(s): (MiAaPQ)AAI9737056 Date Available in IDEALS: 2015-09-25 Date Deposited: 1997
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