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http://hdl.handle.net/11375/19298
Title: | The Room Pressure Spinelloid Phases of the NiGa2O4 - Ni2SiO4 System |
Authors: | Hammond, Robert Paul |
Advisor: | Barbier, Jacques |
Department: | None |
Keywords: | room, pressure, spinelloid, phases, temperature, nickel, crystal, structures |
Publication Date: | Aug-1991 |
Abstract: | <p> The ternary oxide system NiO - Ga2O3 - SiO2 has been studied in the temperature range 1400-1550°C at room pressure. Three phases, corresponding to the spinelloid phases I, II, and V, have been identified on the Ni2GaO4 (spinel) - Ni2SiO4 (olivine) join. These room-pressure phases are isostructural with the high-pressure spinelloid phases of the nickel aluminosilicate system. Single crystals of all three phases have been grown from a silica-rich melt and their crystal structures have been determined by X-ray diffraction. The structure refinements have revealed a strong ordering of the Ga and Si atoms on the tetrahedral sites of all three phases, as well as a clear correlation between spinelloid structure-type and composition. This correlation accounts for the increase in Ni2SiO4 content across the series spinel - phase V - phase I - phase II.</p> |
URI: | http://hdl.handle.net/11375/19298 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
File | Description | Size | Format | |
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Hammond_Robert_P._1991Aug_Masters..pdf | 5.5 MB | Adobe PDF | View/Open |
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