Journal ArticleDOI
Synchrotron X-ray Study of Iron at High Pressure and Temperature.
Reads0
Chats0
TLDR
X-ray synchrotron experiments with in situ laser heating of iron in a diamond-anvil cell show that the high-pressure ε phase, a hexagonal close-packed structure, transforms to another phase (possibly a polytype double-layer hcp) at a pressure of about 38 gigapascals and at temperatures between 1200 and 1500 kelvin.Abstract:
X-ray synchrotron experiments with in situ laser heating of iron in a diamond-anvil cell show that the high-pressure epsilon phase, a hexagonal close-packed (hcp) structure, transforms to another phase (possibly a polytype double-layer hcp) at a pressure of about 38 gigapascals and at temperatures between 1200 and 1500 kelvin. This information has implications for the phase relations of iron in Earth's core.read more
Citations
More filters
Journal ArticleDOI
Melting and crystal structure of iron at high pressures and temperatures
TL;DR: In this article, the e-γ-1 triple point is shown to be 60(±5) GPa and 2800(±200) K at high temperatures and pressures above 60 GPa.
Journal ArticleDOI
Composition and State of the Core
TL;DR: The composition and state of Earth's core, located deeper than 2,900 km from the surface, remain largely uncertain this article, although some static experiments on iron and alloys performed up to inner core pressure and temperature conditions have revealed phase relations and properties of core materials.
Journal ArticleDOI
Growth model of the inner core coupled with the outer core dynamics and the resulting elastic anisotropy
TL;DR: In this paper, a growth tectonic model of Earth's inner core and the resulting model of the seismic anisotropy was presented, where the inner core grows anisotropic if the convection in the outer core is of Taylor column type.
Journal ArticleDOI
Stability of the body-centred-cubic phase of iron in the Earth's inner core
TL;DR: The results of molecular dynamics simulations of iron based on embedded atom models fitted to the results of two implementations of density functional theory found that both point to the stability of the body-centred-cubic iron phase at high temperature and pressure.
Journal ArticleDOI
Measurements of electric anisotropy due to solidification texturing and the implications for the Earth's inner core
TL;DR: In this article, the authors demonstrate that directionally solidified metallic alloys can exhibit a significant elastic anisotropy due to solidification texturing, which is due to the dendrites growing along a particular crystallographic axis.
References
More filters
Journal ArticleDOI
Temperatures in the Earth's core from melting-point measurements of iron at high static pressures
TL;DR: In this paper, the melting point of iron and iron-oxygen compounds at static pressure of up to 3.3 Mbar was estimated for the inner core boundary of the Earth's core.
High-pressure science and technology--1993
TL;DR: In this paper, a joint meeting of the International Association for Research and Advancement of High Pressure Science and Technology and the American Physical Society Topical Group on shock compression of condensed matter was held, which dealt with the full spectrum of both static and dynamic high pressure investigations.
Journal ArticleDOI
Phase Diagram of Iron by in Situ X-ray Diffraction: Implications for Earth's Core
TL;DR: The phase diagram of iron has been studied to 130 gigapascals (1 gigapascal = 104 atmospheres) and 3500 kelvin by a combined laser-heated diamond-anvil cell and x-ray diffraction technique that provides direct identification of the solid phases.
Journal ArticleDOI
Temperatures in earth's core based on melting and phase transformation experiments on iron
TL;DR: Experiments on melting and phase transformations on iron in a laser-heated, diamond-anvil cell to a pressure of 150 gigapascals show that iron melts at the central core pressure of 363.85 gigapasals at 6350 � 350 kelvin.
Journal ArticleDOI
Experimental Evidence for a New Iron Phase and Implications for Earth's Core.
TL;DR: Study of iron phase transition conducted between pressures of 20 to 100 gigapascals and 1000 to 2200 Kelvin provides experimental confirmation of the existence of this new phase of iron, which may form a large part of Earth's core.