Structure of (FexCa1-xO)y(SiO2)1-y liquids and glasses from high-energy x-ray diffraction: Implications for the structure of natural basaltic magmas

J.W.E. Drewitt, C. Sanloup, A. Bytchkov, S. Brassamin, L. Hennet

Research output: Contribution to journalArticlepeer-review

Abstract

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.
Original languageEnglish
Article number224201
Number of pages10
JournalPhysical review B: Condensed matter and materials physics
Volume87
Issue number22
DOIs
Publication statusPublished - 3 Jun 2013

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