Open AccessExploratory studies of silicate melt structure at high pressures and temperatures by in situ X‐ray diffraction
Author(s) -
Funamori Nobumasa,
Yamamoto Shino,
Yagi Takehiko,
Kikegawa Takumi
Publication year - 2004
Publication title -
journal of geophysical research: solid earth
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.67
H-Index - 298
eISSN - 2156-2202
pISSN - 0148-0227
DOI - 10.1029/2003jb002650
Subject(s) - silicate , diffraction , synchrotron , materials science , ion , geology , mineralogy , chemistry , optics , physics , organic chemistry
We have developed synchrotron X‐ray diffraction techniques for studying the structure of silicate melts and have applied them to measuring the structures of MgSiO 3 and CaSiO 3 melts up to 6 GPa. In both melts, it appears that the changes in the local structure around the divalent ions and in the network structure of SiO 4 tetrahedra are the dominant compression mechanisms while a change in the local structure around the Si ion is a secondary mechanism up to at least 6 GPa. The structural changes appear to be larger in CaSiO 3 melt than in MgSiO 3 melt, especially in the vicinity of ambient pressure. These results are consistent with available experimental and theoretical information on MgSiO 3 and CaSiO 3 , and explain discrepancies in previous work.