Spectre Raman de l'oxyde de calcium

Shedding light onto the spectra of lime: Raman and luminescence bands of CaO, Ca(OH)2 and CaCO3

“…680 cm −1 is in good agreement with the measurements by Galvan‐Ruiz et al , who assign all bands to CaO . Contrarily, other studies claim that CaO, like other minerals with halite structure (e.g. MgO and NaCl; compare, for example, Refs .…”

“…MgO and NaCl; compare, for example, Refs . or the halite spectrum in the RRUFF database) does not possess any Raman active modes, except for second order effects involving the scattering of two phonons giving rise to two overlapping and relatively sharp bands at 530 cm −1 and 660 cm −1 as well as to a broad signal at about 1000 cm −1 . Bringing our results into play, we can confirm the spectrum observed by Galvan‐Ruiz et al ., but follow the other studies in the interpretation that CaO does not have a first‐order Raman spectrum.…”

“…Our study confirmed that under usual measurement conditions, the Raman spectrum of CaO does not contain any detectable signals . As mentioned, other minerals with halite structure (such as NaCl or MgO) share this property .…”

“…We confirm the fact that calcium oxide does not possess any first‐order Raman‐active modes . We were not able to detect the expected second‐order contributions with certainty because of their weakness and spectral overlap with a Ca(OH) 2 band.…”

“…653 cm −1 and a weak contribution at 1073 cm −1 . Contrarily, other authors claim that calcium oxide does not have any Raman‐active modes, except for weak second‐order contributions observed in some spectra . The theoretical and experimental data presented by Padanyi shows that the Raman spectrum of Ca(OH) 2 consists of sharp bands at 260 cm −1 , 359 cm −1 , and 3620 cm −1 together with a broad band at 684 cm −1 .…”