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American Mineralogist

Journal of Earth and Planetary Materials

Ed. by Baker, Don / Xu, Hongwu / Swainson, Ian


IMPACT FACTOR 2017: 2.645

CiteScore 2017: 2.31

SCImago Journal Rank (SJR) 2017: 1.440
Source Normalized Impact per Paper (SNIP) 2017: 1.059

Online
ISSN
1945-3027
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Volume 93, Issue 5-6

Issues

Evidence for anomalously large degree of polymerization in Mg2SiO4 glass and melt

Sabyasachi Sen
  • Department of Chemical Engineering and Materials Science, University of California at Davis, Davis, California 95616, U.S.A.
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/ Jean Tangeman
Published Online: 2015-04-01 | DOI: https://doi.org/10.2138/am.2008.2921

Abstract

Ab-initio molecular dynamics simulation of forsterite (Mg2SiO4) melt at 2273 K shows the presence of nearly 40% of the Si atoms as (Si2O7)6- dimers. This result is directly corroborated by the 29Si nuclear magnetic resonance spectrum of bulk Mg2SiO4 glass, prepared by container-less levitation techniques. The presence of a large excess of bridging O atoms associated with the (Si2O7)6- dimers in forsterite glass and melt is in sharp contrast with their complete absence in crystalline forsterite. Such structural differences between the crystal and the melt can have important implications in understanding the dynamics of crystallization and segregation in a primordial magma ocean and the continuing chemical differentiation of the Earth.

Keywords: Ab initio molecular dynamics; forsterite; melt; glass; simulation; NMR; structure

About the article

Received: 2007-12-31

Accepted: 2008-01-18

Published Online: 2015-04-01

Published in Print: 2008-05-01


Citation Information: American Mineralogist, Volume 93, Issue 5-6, Pages 946–949, ISSN (Online) 1945-3027, ISSN (Print) 0003-004X, DOI: https://doi.org/10.2138/am.2008.2921.

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