Computer Science
Scientific paper
Apr 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1037d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 4, pp.1037-1043
Computer Science
Scientific paper
Raman spectroscopy has been used to study the structural variation of a series of glasses along the join diopside-albite. The spectra show that these compositions can be characterized by a smooth and continuous variation in silicate speciation as a function of composition. However, the presence of three discrete bands in the low frequency region of intermediate composition glasses at 642 cm -1 , 580 cm -1 , and 470 cm -1 , which change only in relative intensity and not in frequency, argues that the change in speciation is accompanied by the formation of molecular clusters. The 642 cm -1 and 470 cm -1 bands suggest structures similar to the end-member components Di and Ab, while the 580 cm -1 band is interpreted to have a structure similar to a disilicate. There is no evidence for significant Si/Al mixing on tetrahedral sites with non-bridging oxygens, nor is there any evidence that Ca and/or Mg charge-balance Al in preference to Na. These observations should be taken into account to more accurately model the entropy of mixing of diopside-albite solutions.
Dickinson James E. Jr.
Scarfe Christopher M.
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