The atomistic structure of (FeCaO) (SiO) liquids, namely, fayalite (x = 1, y = 0.667), ferrosilite (x = 1, y = 0.5), and hedenbergite (x = 0.5, y = 0.5), was measured by using high-energy x-ray diffraction combined with laser-heated aerodynamic levitation. Measurements were also made for hedenbergite glass, formed via supercooling the liquid. The results unequivocally prove that Fe atoms are both four and sixfold coordinated by oxygen atoms in all compositions studied from the two distinct bond distances measured at r=1.93 and 2.20Å, respectively. The results quantitatively reveal up to 40% and 55% FeO species residing in liquid fayalite and ferrosilite, respectively. From the real-space peak positions, the results also reveal the presence of both FeO and FeO species within a basaltic liquid and glass for which the geophysical consequences are briefly discussed.
|Number of pages||10|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 3 Jun 2013|