Scanning transmission electron microscopy (STEM) was used to examine sintered and hot-pressed aluminum-doped silicon carbide; grain boundary segregation of Al was observed in both materials. Semi-quantitative analysis was carried out on the Al-saturated hot-pressed material. An estimated heat of segregation between 116 and 174 kJ/mol was calculated from the STEM data and equilibrium segregation theory. Strain energy as a driving force was considered negligible. The data are consistent with a ...
Unalloyed TiPtAu ohmic contacts were formed on n-type GaAs by preparing surfaces having over 10 to the 19th power carriers/cc prior to metal deposition. Two methods were used, vapor phase epilayer growth and pulse electron beam annealed (PEBA) selenium implants. The former method yielded specific contact resistivities .000008 < or = r(c) < or = .00009 ohm sq. cm and was successfully applied on power FET devices. Much lower resistivities, ...
Newly developed polymers were examined for possible usage in developing fire resistant, nontoxic nonmetallic parts or assemblies for aircraft interiors. feasibility for the development of clear films for new decorative laminates, compression moldings, injection molded parts, thermoformed plastic parts, and flexible foams was considered. (Author, modified).
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