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Experimental Evidence for a New Iron Phase and Implications for Earth's Core

Iron is known to occur in four different crystal structural forms. One of these, the densest form (epsilon phase, hexagonal close-packed) is considered to have formed Earth's core. Theoretical arguments based on available high-temperature and high-pressure iron data indicate the possibility of a fif... Full description

Journal Title: Science (New York N.Y.), 28 May 1993, Vol.260(5112), pp.1312-4
Main Author: Saxena, S K
Other Authors: Shen, G , Lazor, P
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0036-8075 ; PMID: 17755425 Version:1
Link: http://pubmed.gov/17755425
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recordid: medline17755425
title: Experimental Evidence for a New Iron Phase and Implications for Earth's Core
format: Article
creator:
  • Saxena, S K
  • Shen, G
  • Lazor, P
subjects:
  • Crystal Lattices
  • Earth CORE
  • Iron
  • Phase Stability (Materials)
  • Phase Transformations
  • Laser Heating
  • Pressure Dependence
  • Temperature Dependence
  • Geophysics (Ah)
  • Article
ispartof: Science (New York, N.Y.), 28 May 1993, Vol.260(5112), pp.1312-4
description: Iron is known to occur in four different crystal structural forms. One of these, the densest form (epsilon phase, hexagonal close-packed) is considered to have formed Earth's core. Theoretical arguments based on available high-temperature and high-pressure iron data indicate the possibility of a fifth less dense iron phase forming the core. Study of iron phase transition conducted between pressures of 20 to 100 gigapascals and 1000 to 2200 Kelvin provides an experimental confirmation of the existence of this new phase. Thee epsilon iron phase transforms to this lower density phase before melting. The new phase may form a large part of Earth's core.
language: eng
source:
identifier: ISSN: 0036-8075 ; PMID: 17755425 Version:1
fulltext: fulltext
issn:
  • 00368075
  • 0036-8075
url: Link


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identifierISSN: 0036-8075 ; PMID: 17755425 Version:1
descriptionIron is known to occur in four different crystal structural forms. One of these, the densest form (epsilon phase, hexagonal close-packed) is considered to have formed Earth's core. Theoretical arguments based on available high-temperature and high-pressure iron data indicate the possibility of a fifth less dense iron phase forming the core. Study of iron phase transition conducted between pressures of 20 to 100 gigapascals and 1000 to 2200 Kelvin provides an experimental confirmation of the existence of this new phase. Thee epsilon iron phase transforms to this lower density phase before melting. The new phase may form a large part of Earth's core.
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subjectCrystal Lattices ; Earth CORE ; Iron ; Phase Stability (Materials) ; Phase Transformations ; Laser Heating ; Pressure Dependence ; Temperature Dependence ; Geophysics (Ah) ; Article;
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abstractIron is known to occur in four different crystal structural forms. One of these, the densest form (epsilon phase, hexagonal close-packed) is considered to have formed Earth's core. Theoretical arguments based on available high-temperature and high-pressure iron data indicate the possibility of a fifth less dense iron phase forming the core. Study of iron phase transition conducted between pressures of 20 to 100 gigapascals and 1000 to 2200 Kelvin provides an experimental confirmation of the existence of this new phase. Thee epsilon iron phase transforms to this lower density phase before melting. The new phase may form a large part of Earth's core.
pmid17755425
doi10.1126/science.260.5112.1312
eissn10959203
date1993-05-28