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The report summarizes the results of optical investigations obtained on a series of Au-Cu alloy films. Emphasis is given to problems relating to the preparation and characterization of these films in disordered and ordered phases. In particular, the importance of heat treatments by simultaneous resistance measurements and of adjusting both the temperature and kinetics of annealing and quenching cycles is demonstrated. Interpretation of the observed optical properties of the disordered alloys is given according to recently propsoed theories based on a coherent potential approximation. Finally, property changes are related to phase transformatoins. (Author).
New techniques were developed for making sensitive optical measurements on alloys over a wide range of the spectrum from the ultraviolet to the far infrared. Differences between samples with as little as 0.1 at .% impurity could be studied. The technique was used to optical studies of a number of noble metal-transition metal alloys. It was possible to make detailed quantitative comparisons between the optical data and the theory of dilute alloys. By comparisons between alloys which could be successfully described by the theory and those that could not, a systematic inadequacy of the theory was discovered. (Author).
This book presents a comprehensive account of the phenomenon of spontaneous ordering. The phenomenon, which can be categorized as a self-organized process, is observed to occur spontaneously during epitaxial growth of certain ternary alloy semiconductors and results in a modification of their structural, electronic, and optical properties. There has been a great deal of interest in learning how to control this phenomenon so that it may be used for tailoring desirable electronic and optical properties. There has been even greater interest in exploiting the phenomenon for its unique ability to provide an experimental environment of controlled alloy statistical fluctuations. As such, it impacts areas of semiconductor science and technology related to the materials science of epitaxial growth, statistical mechanics, and electronic structure of alloys and electronic and photonic devices. During the past two decades, significant progress has been made toward understanding the mechanisms that drive this phenomenon and the changes in physical properties that result from it. A variety of experimental techniques have been used to probe the phenomenon and several attempts made at providing theoretical models, both for the ordering mechanisms as well as electronic structure changes. The various chapters of this book provide a detailed account of these efforts during the past decade.