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Progress in Earth and Planetary Science
Fig. 6 | Progress in Earth and Planetary Science

Fig. 6

From: 29Si solid state NMR and Ti K-edge XAFS pre-edge spectroscopy reveal complex behavior of Ti in silicate melts

Fig. 6

Ti k-edge X-ray absorption fine structure (XAFS) pre-edge peak positions and mixing curves. The Ti pre-edge feature is sensitive to the coordination environment and is used to assess average Ti4+ coordination in the experimental glasses. Grey regions and grey, filled symbols are the pre-edge peak positions of minerals and glasses with known Ti coordination (Farges et al. 1996b). White filled symbols are mixing curves between end-member [4]Ti-bearing forsterite, [5]Ti-bearing fresnoite, and [6]Ti-bearing titanite. Red symbols are the peak positions of NS8 glasses with the mol% TiO2 indicated next to the symbols. As Ti concentration increases, the peak positions shift along a trend similar to the mixing of [4]Ti and [5]Ti, indicating the average coordination of Ti in the glasses decreases with increasing bulk TiO2 content

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