Synchrotron X-Ray Study of Iron at High Pressure and Temperature

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 (hcp) structure, transforms to another phase (possibly a polytype double-layer hcp) at a pressure of about 38 gigapascals and at temperatures between...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1995-09, Vol.269 (5231), p.1703-1704
Main Authors: Saxena, S. K., Dubrovinsky, L. S., Häggkvist, P., Cerenius, Y., Shen, G., Mao, H. K.
Format: Article
Language:English
Subjects:
Climate
Condensed matter: structure, mechanical and thermal properties
Core
Core (Geology)
Earth
Earth core
EARTHS CORE
Equations of state, phase equilibria, and phase transitions
Exact sciences and technology
Face centered cubic lattices
Grade Point Average
Heat
High pressure
Iron
Iron (Metal)
Laser beams
Laser heating
Lasers
Materials science
Melting
Organic Chemistry
Phase transformations
Physics
Rapid quenching
Solid-solid transitions
Specific phase transitions
Synchrotron radiation
Synchrotrons
Temperature
X-rays
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Summary: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 (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.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.269.5231.1703