Document Detail

Phase Transformations and Metallization of Magnesium Oxide at High Pressure and Temperature.
MedLine Citation:
PMID:  23180773     Owner:  NLM     Status:  Publisher    
Magnesium oxide (MgO) is representative of the rocky materials comprising the mantles of terrestrial planets, such that its properties at high temperatures and pressures reflect the nature of planetary interiors. Shock-compression experiments on MgO to pressures of 1.4 TPa reveal a sequence of two phase transformations: (i) from B1 (NaCl) to B2 (CsCl) crystal structures above 0.36 TPa, and (ii) from electrically insulating solid to metallic liquid above 0.60 TPa. The transitions exhibit large latent heats that are likely to affect the structure and evolution of super-Earths. Together with data on other oxide liquids, we conclude that magmas deep inside terrestrial planets can be electrically conductive, enabling magnetic field-producing dynamo action within oxide-rich regions and blurring the distinction between planetary mantles and cores.
R Stewart McWilliams; Dylan K Spaulding; Jon H Eggert; Peter M Celliers; Damien G Hicks; Raymond F Smith; Gilbert W Collins; Raymond Jeanloz
Related Documents :
2061843 - Responses observed in individual arterioles and venules of rat skeletal muscle during s...
2923003 - Metabolic control of large-bore arterial resistance vessels, arterioles, and veins in c...
15533493 - Simultaneous administration of vardenafil and tamsulosin does not induce clinically sig...
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-11-22
Journal Detail:
Title:  Science (New York, N.Y.)     Volume:  -     ISSN:  1095-9203     ISO Abbreviation:  Science     Publication Date:  2012 Nov 
Date Detail:
Created Date:  2012-11-27     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0404511     Medline TA:  Science     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Geophysical Laboratory, Carnegie Institution of Washington, 5251 Broad Branch Road NW, Washington, DC 20015, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Visualizing the Influenza Genome.
Next Document:  Organization of the influenza virus replication machinery.