Four specific studies are presented in this thesis, regarding the high-pressure phases of the three compounds. ZrO$\sb2$ was studied at pressures of up to 73 GPa using energy dispersive X-ray (EDX) diffraction techniques. The quenched phase was analysed using angle dispersive X-ray (ADX) diffraction with imaging plates, and was identified as having a cotunnite-type structure (space group Pnma) by Rietveld refinement. HfO$\sb2$ was also studied to 72 GPa using EDX diffraction measurements, and its quenched phase was also identified as having a cotunnite-type structure, based on the simularities of its EDX and Raman spectra with those of the quenched phase of ZrO$\sb2$. TiO$\sb2$ was involved in two separate studies. The first is a Raman spectroscopic study up to 73 GPa, starting with anatase. Some EDX diffraction measurements were also taken to pressures up to 105 GPa. Additionally, EDX diffraction measurements of TiO$\sb2$ up to 28 GPa were taken to determine the equations of state of its high-pressure phases, starting with anatase and furtile at atmospheric pressure. (Abstract shortened by UMI.)
| Identifer | oai:union.ndltd.org:uottawa.ca/oai:ruor.uottawa.ca:10393/9527 |
| Date | January 1996 |
| Creators | Lagarec, Ken. |
| Contributors | Desgreniers, Serge, |
| Publisher | University of Ottawa (Canada) |
| Source Sets | Université d’Ottawa |
| Detected Language | English |
| Type | Thesis |
| Format | 148 p. |
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