Melting and Phase Relations in Iron-Silicon Alloys with Applications to the Earth's Core
dc.contributor.advisor | Campbell, Andrew | en_US |
dc.contributor.author | Miller, Noah Andrew | en_US |
dc.contributor.department | Geology | en_US |
dc.contributor.publisher | Digital Repository at the University of Maryland | en_US |
dc.contributor.publisher | University of Maryland (College Park, Md.) | en_US |
dc.date.accessioned | 2009-10-06T06:01:28Z | |
dc.date.available | 2009-10-06T06:01:28Z | |
dc.date.issued | 2009 | en_US |
dc.description.abstract | Experiments were performed on iron-silicon alloys to determine their suitability as analog compositions for the Earth's core. Starting compositions with 9 wt.% silicon and 16 wt.% silicon were compressed in diamond anvil cells and laser-heated. The melting temperatures of the alloys were measured up to 52 GPa using a recently developed optical system. Both curves show a melting point depression from pure iron but intersect at ~50 GPa. The two starting compositions were also studied up to 90 GPa and over 3500 K in synchrotron x-ray diffraction experiments, and phase diagrams were constructed for both compositions that show significant deviation from the pure iron phase diagram. Based on this synchrotron data, a model was produced which predicts the core to contain 8.6 to 11.1 wt.% silicon for a core-mantle boundary temperature of 4000 K. | en_US |
dc.format.extent | 940821 bytes | |
dc.format.mimetype | application/pdf | |
dc.identifier.uri | http://hdl.handle.net/1903/9536 | |
dc.language.iso | en_US | |
dc.subject.pqcontrolled | Geology | en_US |
dc.subject.pqcontrolled | Geophysics | en_US |
dc.subject.pquncontrolled | Alloy | en_US |
dc.subject.pquncontrolled | Core | en_US |
dc.subject.pquncontrolled | Earth | en_US |
dc.subject.pquncontrolled | Iron | en_US |
dc.subject.pquncontrolled | Pressure | en_US |
dc.subject.pquncontrolled | Silicon | en_US |
dc.title | Melting and Phase Relations in Iron-Silicon Alloys with Applications to the Earth's Core | en_US |
dc.type | Thesis | en_US |
Files
Original bundle
1 - 1 of 1
Loading...
- Name:
- Miller_umd_0117N_10558.pdf
- Size:
- 918.77 KB
- Format:
- Adobe Portable Document Format