Melting and Phase Relations in Iron-Silicon Alloys with Applications to the Earth's Core

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dc.contributor.advisorCampbell, Andrewen_US
dc.contributor.authorMiller, Noah Andrewen_US
dc.contributor.departmentGeologyen_US
dc.contributor.publisherDigital Repository at the University of Marylanden_US
dc.contributor.publisherUniversity of Maryland (College Park, Md.)en_US
dc.date.accessioned2009-10-06T06:01:28Z
dc.date.available2009-10-06T06:01:28Z
dc.date.issued2009en_US
dc.description.abstractExperiments 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.extent940821 bytes
dc.format.mimetypeapplication/pdf
dc.identifier.urihttp://hdl.handle.net/1903/9536
dc.language.isoen_US
dc.subject.pqcontrolledGeologyen_US
dc.subject.pqcontrolledGeophysicsen_US
dc.subject.pquncontrolledAlloyen_US
dc.subject.pquncontrolledCoreen_US
dc.subject.pquncontrolledEarthen_US
dc.subject.pquncontrolledIronen_US
dc.subject.pquncontrolledPressureen_US
dc.subject.pquncontrolledSiliconen_US
dc.titleMelting and Phase Relations in Iron-Silicon Alloys with Applications to the Earth's Coreen_US
dc.typeThesisen_US

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