| Synthesis and Equation of State of (Mg,Fe) SiO3 Perovskite to Over 100 Gigapascals. | |
| | |
MedLine Citation:
|
PMID: 17833627 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
|
Silicate perovskite of composition (Mg(0.88)Fe(0.12)) SiO(3) has been synthesized in a laser-heated diamond-anvil cell to a pressure of 127 gigapascals at temperatures exceeding 2000 K. The perovskite phase was identified and its unit-cell dimensions measured by in situ x-ray diffraction at elevated pressure and room temperature. An analysis of these data yields the first high-precision equation of state for this mineral, with values of the zero-pressure isothermal bulk modulus and its pressure derivative being K(0T) = 266 +/- 6 gigapascals and K'(0T) = 3.9 +/- 0.4. In addition, the orthorhombic distortion of the silicate-perovskite structure away from ideal cubic symmetry remains constant with pressure: the lattice parameter ratios are b/a = 1.032 +/- 0.002 and c/a = 1.444 +/- 0.006. These results, which prove that silicate perovskite is stable to ultrahigh pressures, demonstrate that perovskite can exist throughout the pressure range of the lower mantle and that it is therefore likely to be the most abundant mineral in Earth. |
| | |
Authors:
|
E Knittle; R Jeanloz |
Related Documents
:
|
20608697 - Nitromethane decomposition under high static pressure. 16492747 - Equation of state of the postperovskite phase synthesized from a natural (mg,fe)sio3 or... 18041017 - Determination of solvent-trapped products obtained by photolysis of aryl azides in 2,2,... 7563087 - Heterogeneity of e. coli rna polymerase revealed by high pressure. 6880967 - Peripheral vascular adrenergic depression during hypotension induced by e coli endotoxin. 10797127 - Ventilation heterogeneity in excised lobes: effect of tidal volume. |
Publication Detail:
|
Type: Journal Article |
Journal Detail:
|
Title: Science (New York, N.Y.) Volume: 235 ISSN: 0036-8075 ISO Abbreviation: Science Publication Date: 1987 Feb |
Date Detail:
|
Created Date: 2010-06-08 Completed Date: 2010-07-02 Revised Date: - |
Medline Journal Info:
|
Nlm Unique ID: 0404511 Medline TA: Science Country: United States |
Other Details:
|
Languages: eng Pagination: 668-70 Citation Subset: - |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
|
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: New Strong Cement Materials: Chemically Bonded Ceramics.
Next Document: Induced Resistance and Interspecific Competition Between Spider Mites and a Vascular Wilt Fungus.