Linked Life Data

14564003

Source:http://linkedlifedata.com/resource/pubmed/id/14564003

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5644
pubmed:dateCreated
2003-10-17
pubmed:abstractText
Compressed under ambient temperature, graphite undergoes a transition at approximately 17 gigapascals. The near K-edge spectroscopy of carbon using synchrotron x-ray inelastic scattering reveals that half of the pi-bonds between graphite layers convert to sigma-bonds, whereas the other half remain as pi-bonds in the high-pressure form. The x-ray diffraction pattern of the high-pressure form is consistent with a distorted graphite structure in which bridging carbon atoms between graphite layers pair and form sigma-bonds, whereas the nonbridging carbon atoms remain unpaired with pi-bonds. The high-pressure form is superhard, capable of indenting cubic-diamond single crystals.
pubmed:language
eng
pubmed:journal
pubmed:status
PubMed-not-MEDLINE
pubmed:month
Oct
pubmed:issn
1095-9203
pubmed:author
pubmed:issnType
Electronic
pubmed:day
17
pubmed:volume
302
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
425-7
pubmed:dateRevised
2007-3-19
pubmed:year
2003
pubmed:articleTitle
Bonding changes in compressed superhard graphite.
pubmed:affiliation
Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA. wmao@chicago.edu
pubmed:publicationType
Journal Article