Raman and infrared spectra of carbonates of calcite structure

Abstract

The Raman and mid-range infrared spectra have been measured on natural limestone and dolomite minerals. The carbonate minerals show four prominent absorption bands in the regions 1450-1420, 890-870, 720-700 and 1000-1100 cm −1 . The positions of the wavenumbers are unique for each carbonate mineral and are thus diagnostic of their mineralogy. Calcite and dolomite groups are characterized by the Raman wavenumbers at 288 and 309 cm −1 and the infrared absorption bands at 712 and 728 cm −1 , respectively. The principal wavenumber at 1092 cm −1 in the limestone spectra is accompanied by two satellites with values of 1062 and 1075 cm −1 . The observed non-split peaks n 2 and n 4 in the infrared spectra of limestone indicate the presence of calcite structure in all these samples. The principal reflections occurring at the d-spacings, 3.03482, 1.91658 and 1.87962Å, confirm the presence of calcite structure in limestone minerals. The principal reflections occurring at the d-spacings, 3.037, 1.79179 and 2.19750Å, confirm the existence of dolomite structure in the dolomite minerals. The calculated lattice parameters for the limestone minerals are: a = 4.9781Å, c = 17.1188Å and V = 367.392(Å) 3 and the corresponding values for the dolomite minerals are: a = 4.8247Å, c = 15.9868Å and V = 322.28 (Å) 3 .

CO2 Mineralization Using Brine Discharged from a Seawater Desalination Plant

“…Long et al [34] reported that peaks at 724, 726, and 730 cm −1 were obtained from calcite particles including 30 mol% Mg. Similarly, Gunasekaran et al [34,35] and Xu and Poduska [36] reported dolomite peaks at 729 and 730 cm −1 , respectively. These peaks arose from CO 3 2− .…”

“…CO3 2− ions in dolomite also absorbed IR near this position, at 853 cm −1 . Meanwhile, the peak at 877 cm −1 indicates the presence of CaCO3 [35,36,[38][39][40]. Although we expected that the third and fourth cycles would produce Mg carbonates that excluded Ca, some of the Ca remaining in the suspension after the second cycle managed to participate in the carbonation of Mg.…”

“…Consequently, it is possible to assign the IR peak at 727 cm −1 to Mg carbonates. In addition, the peaks at 873 and 1406 cm −1 were from the CO 3 2− ions in CaCO 3 [35,37], which was already known to be present due to XRD analysis. The particles obtained after the third and fourth cycles both showed peaks at 852 and 877 cm −1 .…”

Трансформация Структуры Поверхности Мрамора Под Влиянием Ударной Волны

“…Первая (1395.5 cm −1 ) соответствует поперечным, а вторая (1550 cm −1 ) -продольным коле-баниям кристаллической решетки кальцита [21][22][23][24].…”

Acid resistance of calcium aluminate cement–fly ash F blends

“…The spectrum of the sample core after acid exposure resembled the unexposed sample. The surface of the CPC was primarily composed of sulfates; the presence of weak bands at 1220 cm (Gunasekaran et al, 2006;Xyla and Koutsoukos, 1989;Ylmen and Jaglid, 2013), the calciumsilicate-hydrate-related Si-O asymmetric stretching (V as Si-O ) in the silicate (SiO 4 −4 ) wide band at 965 cm −1 (Mollah et al, 2000;Taddei et al, 2014) and the three quartz-related bands at 1080, 799 and 693 cm −1 (Guan et al, 2014;Ramasamy and Suresh, 2009;Saikia et al, 2008). The spectrum from the core of the acid-exposed sample was similar to that of the control.…”