Document Detail

Helium penetrates into silica glass and reduces its compressibility.
MedLine Citation:
PMID:  21673666     Owner:  NLM     Status:  In-Data-Review    
SiO(2) glass has a network structure with a significant amount of interstitial voids. Gas solubilities in silicates are expected to become small under high pressure due to compaction of voids. Here we show anomalous behaviour of SiO(2) glass in helium. Volume measurements clarify that SiO(2) glass is much less compressible than normal when compressed in helium, and the volume in helium at 10 GPa is close to the normal volume at 2 GPa. X-ray diffraction and Raman scattering measurements suggest that voids are prevented from contracting when compressed in helium because helium penetrates into them. The estimated helium solubility is very high and is between 1.0 and 2.3 mol per mole of SiO(2) glass at 10 GPa, which shows marked contrast with previous models. These results may have implications for discussions of the Earth's evolution as well as interpretations of various high-pressure experiments, and also lead to the creation of new materials.
Tomoko Sato; Nobumasa Funamori; Takehiko Yagi
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Publication Detail:
Type:  Journal Article     Date:  2011-06-14
Journal Detail:
Title:  Nature communications     Volume:  2     ISSN:  2041-1723     ISO Abbreviation:  Nat Commun     Publication Date:  2011  
Date Detail:
Created Date:  2011-06-15     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101528555     Medline TA:  Nat Commun     Country:  England    
Other Details:
Languages:  eng     Pagination:  345     Citation Subset:  IM    
Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan.
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