The mainly research is by adding the rare-earth metal gadolinium salts with sol-gel process to form the gadolinium -doped titanium dioxide, and by forming the liquid crystal template with the non-ionic surfactant to form the mesostructure of titanium dioxide. And the research has aimed at the using different non-ionic surfactant, the different pH value, the different solvent of water/ethanol ratio, the hydrothermal process or not, and the gadolinium content. We discussed these factors how to affect the titanium dioxide in the physical property, the chemical property, or structure influence. Using the XRD to measure the mesostucture of titanium dioxide and the crystallization of titanium dioxide, and we observe the shape and particle size of titanium dioxide with SEM. We use UV-visible spectrum to observe absorption spectrum of titanium dioxide. The result discovers that surfactant effect is using triblock copolymer, poly (ethylene oxide) - poly (propylene oxide) - poly (ethylene oxide), the titanium dioxide has anatase and rutile crystallization, and particle aggregation. The pH affects the partic le size and the shape. In pH is 5.8, the titanium dioxide has anatase and rutile crystallization. In water/ethanol ratio effect, we use solvent including ethanol, the titanium dioxide has anatase and rutile. Through hydrothermal process, titanium dioxide has little brookite crystallization and the few fibrous titanium dioxides. The doping gadolinium effect is the anatase is reducing with gadolinium content increasing, and from the UV-visible spectrum, the doping gadolinium titanium dioxide has the red shift. The titanium dioxide using polyoxyethylene sorbitan monostearate and doping gadolinium has the anatase, and absorbs a longer wavelength, and when the doping content is 1% titanium dioxide has a better absorption.

The metal hydride used as hydrogen storage material has come into public notice. It is very important to understand the crystal structure and the permutation of hydrogen and the metal crystal structure of hydride for developing industrial hydrogen storage material. The tetrahedral formation of the atom intervals of titanium/zirconium alloys benefits the absorbing of hydrogen atoms. Especially under high temperature, the titanium/zirconium alloys have high affinity on hydrogen, and hydrogen atoms help to absorb within the titanium/zirconium alloys can spread and enter materials fast on the surface, this way will get uniform saturation solid solution. Therefore, we use hydrogen gas in the high-temperature gaseous phase to melt the titanium/zirconium alloys and observe the crystal structure and morphology of hydride precipitates with transmission electron microscopy. The research contents are as follows: (1) In Ti-H system, ageing of quenched specimens which contained the hydrides are found to have a face-centered tetragonal structure (£^-titanium hydride). Ageing of furnace-cooled specimens which contained the hydrides are found to have a face-centered cubic structure (£_-titanium hydride). (2) In Zr-H system, ageing of quenched specimens which contained the hydrides are found to have a face-centered tetragonal structure (£^-zirconium hydride). Ageing of furnace-cooled specimens which contained the grain-boundary hydrides are found to have a face-centered cubic structure (£_-zirconium hydride).

Thesis (Ph. D.)--University of Texas at Austin, 1999. / Vita. Includes bibliographical references (leaves 166-172). Available also in a digital version from Dissertation Abstracts.

published_or_final_version / Dental Materials Science / Master / Master of Science in Dental Materials Science

published_or_final_version / Chemistry / Master / Master of Philosophy

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