Conference Reports
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actions, which yielded a value of 67 kcal/ mole. Hypothesis was made for measurem e n t of the p r e - e x p o n e n t i a l factor of gallium/Si(100), indicating that gallium surface atoms are mobile in only one direction along rows of Si pairs on a 2 x 1 reconstructed surface of Si(100). T.J. Coutts (SERI) described "Contact Resistance Studies in p-InP," the goal of which was to develop a metallization system capable of maintaining low contact resistance to p-InP. He showed that Au:Be contacts prepared by evaporation are not ideal for p-InP, but other systems do show promise. Work on a different aspect was discussed in a paper by A. Banerji (Technical University of Berlin). "A New Grain Refiner of Al-Ti-C for Aluminum and Its Alloys" described the development of a process yielding highly effective, fine TiC dispersoids in a hardener alloy designed to nucleate many small grains in solidifying aluminum alloys. P.J. Wilbur (Colorado State University) reviewed "The Effects of Ultrahigh Current D e n s i t y Ion I m p l a n t a t i o n on Bulk Microstructure," describing his broadb e a m , u l t r a h i g h - c u r r e n t - d e n s i t y ion implanter (1,500 /xA/cm2. He showed that ultrahigh current implantation can yield superior surface properties associated with short implantation times and deeper ion penetration, compared with more usual ion beam currents. B. C l e m e n s (GM Research) gave an invited talk on interfacial research in metal multilayers. He described the effects of structural coherence on the x-ray diffraction patterns from metal-metal superlattices. In several cases, amorphous interfaces have been observed. Also invited was T. Furtak (Colorado School of Mines), who discussed recent developments in Raman scattering from surfaces and interfaces. This technique employs surface optical enhancement of the Raman effect to probe
the vibrational s t r u c t u r e of molecules within a m o n o l a y e r of the surface or interface. Examples from a wide range of microelectronics, electrochemistry, and corrosion problems were described. In a paper on electrorheological fluids, H. Conrad (North Carolina State University) reported electrical characteristics of these materials, focusing on the electroviscous and other effects. B. Koel (University of Colorado) presented a paper on the chemical tailoring of materials to produce unique surface properties. He described co-adsorption of small molecules with potassium and bismuth on P t ( l l l ) surfaces, showing the influence of geometric and electronic structure on the process. G.D. Turner (U.S. Air Force Academy) discussed the nature of interfacial energies between solidifying immiscible liquids and their efJects on microgravity solidification. The work was directed toward developing a new class of alloys based on liquids that are immiscible in the earth's gravity, but which present potential c a n d i d a t e s for processing in space. The Fe-SiC interface was the subject of a paper presented by K.M. Geib (Colorado State University). He reported the presence of
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