DURIP Synthesis and Study of Preceramic Polymers/Ceramic Precursors, MetalSilicides, and Polymers with Unique Optical and Electronic Properties

摘要

The thermal analysis system and tube furnace have been used to conduct initialstudies on the conversion of alkoxysiloxy derivatives to metal silicate solid state materials. These results, pertaining titanium, zirconium, and hafnium, are described. Interest in low-temperature chemical routes to ceramic materials is based largely on the potential for generating metastable structures with unusual properties, or on development of improved processing methods. The sol-gel method in particular has attracted attention as a low temperature route to oxides. This method can be extended to the synthesis of mixed metal oxides, however the formation of homogeneous materials can be complicated by differences in hydrolysis rates for the starting metal compounds. Sol-gel processes have been utilized to produce titanium oxides or zirconium oxides containing silicates in the form of thin films, fibers, or monoliths. Materials of this type find applications that take advantage of their optical properties, chemical inertness, high melting points, insulating properties, and fracture toughness.