Vibrational spectra of the hydrated carbonate minerals ikaite, monohydrocalcite, lansfordite and nesquehonite

Carbonation of Portland Cement Studied by Diffuse Reflection Fourier Transform Infrared Spectroscopy

“…However, the signature of the CaCO 3 formed in this study does not exactly match any of the spectra of calcite, vaterite or aragonite (Xyla and Koutsoukos 1989). However, there are also hydrated forms of CaCO 3 , such as monohydrocalcite (CaCO 3 ÁH 2 O), ikaite (CaCO 3 Á6H 2 O) and amorphous calcite (Lam et al 2007;Andersen and Ljerka Brečević 1991;Coleyshaw et al 2003). The shape of the large carbonate band, at 1,400-1,600 cm -1 , with two distinct peaks and the increase of water at 1,650 cm -1 is similar to the infrared spectrum of both monohydrocalcite and amorphous calcium carbonate (Lam et al 2007;Andersen and Ljerka Brečević 1991;Coleyshaw et al 2003).…”

Monohydrocalcite and Its Relationship to Hydrated Amorphous Calcium Carbonate in Biominerals

“…[39] For biogenic ACC, a value of 866 cm -1 has been reported. [27] Monohydrocalcite shows bands at 590 (lattice), 700/727 (ν 4 [8,27,40,41] We therefore conclude that monohydrocalcite and ACC can be distinguished by IR spectroscopy by observing the carbonate band at around 870 cm -1 . Figure 5.…”

“…Pyura Pachyderma tina [21] ACC in sternal deposits of 2.38 3.8 14 3.00 1.4 7 3.72 0.4 1 (3.89) 6 109 Porcellio scaber [28] ACC prepared in vitro [36] 2. 41 5 - [a] 3.92 6 47 Biomphalaria glabrata [20,29] Aragonite [28] 2. [a] Shell was not included in the fit.…”

Mineralogical and Spectroscopic Study of Nesquehonite Synthesized by Reaction of Gaseous Co2 With Mg Chloride Solution

“…8) showed the symmetric stretching (v1) and the bending (v2) modes of CO3 2-at 1097.94 cm -1 and at 853.61 cm -1 , respectively. The three bands at 1520, 1466.06, 1420.06 cm -1 are ascribed to the split v3 antisymmetric stretching mode (Kloprogge et al, 2003;Coleyshaw et al, 2003;Morgan et al, 2015).The stretching of the O-H and the H2O molecule gives rise to broad bands in the region between 2500-4000 cm -1 (Ferrini et al, 2008;Kloprogge et al, 2003). The bands at 3326.33, 3455.14, 3564.25 cm -1 can be ascribed to OH-stretching modes of water in the crystal structure of the nesquehonite (Hopkinson et al, 2012;Hopkinson et al, 2008).…”