Figure 3
Structure of compensated glasses as shown by Raman spectroscopy. (A) Raman spectra of [Na(1-XK)K XK ]AlSiO4 glasses for various MAE compositions. Arrows show the strong increases of the intensity of the Boson Peak, and of those of the D 1 and D 2 peaks. The band assigned to T-O (T = Si, Al) stretching in TO4 tetrahedral units is visible at ~1000 cm−1, it increases in frequency with X K . The R peak is assigned to T-O-T bending, and the peak at ~780 cm−1 to rocking of TO4 units. See ref.14 for references for those assignments. (B,C) Boson Peak Intensity and Frequency for glasses with different Al/Si ratios as a function of their X K . (D) Area of the D 2 band (540–680 cm−1) assigned to three-membered rings normalized to the area of the total T-O-T bending modes region (230–680 cm−1). (E) Raman shift of the band assigned to T-O stretching in TO4 units. Errors are given at the 1σ confidence interval; if not visible, they are smaller than symbols.
