Figure 8
Overlapped spectra of the 18 samples, showing differences in relative intensities for the different mineral band components. Also plotted are second derivative spectra used to guide number of components fitted. All spectra were scaled to the same height for the 1450 cm−1 CH2 deformation mode shown in (C) before truncating to the selected regions for band resolution. (A) CO32− ν1 stretch modes for B-substituted CO32− and (B) shows the resolved bands for this region. (C) PO43− symmetric stretch region with (D) the resolved PO43− and the A-substituted CO32− mode at 947 cm−1.
