The Strontianite Raman spectrum and its interpretation are presented below.
Strontianite sample data
|Description:||Strontianite mineral sample|
|Source:||Grigore Cobălcescu Museum|
|Locality:||Drensteinfurt – Germany|
|Owner:||Department of Geology – Alexandru Ioan Cuza University of Iasi|
Strontianite sample image
Main Raman bands of Strontianite
|Wavenumbers (cm-1):||1069vs, 700w, 242m|
|Instrument settings:||Raman spectrograph HE 532nm (Horiba Jobin-Yvon)|
|Spectral resolution:||2 cm-1|
|Conditions of measurement:||at room temperature|
Interpretation of Raman spectrum of Strontianite
The characteristic Raman band due to the external vibration mode (M-CO3) at 242 cm-1, and the ν1 internal mode (symmetric stretching) at 1069 cm-1 are easily distinguished. In the Raman spectrum of the strontianite sample don’t have values below 200 cm-1 because the spectral range is between 200-3400 cm-1.
This spectrum is governed by the very strong Raman line (1069 cm-1) atributed to the ν1 symmetric stretching mode of the carbonate group. The ν4 mode of CO3 has values at 700 cm-1. The ν2 vibration mode is not observed in this study; ν3 vibration are observed at 1445 and 1543 cm-1.
The frequencies of all Raman bands observed in Strontianite, Aragonite and Witherite can not be corelated with the atomic masses of the cations.
|Buzgar and Apopei, 2009||Krishnamurti, 1960||Assignment|
|ν4 symmetric deformation|
|NO||855||ν2 asymmetric deformation|
|1069||1074||ν1 symmetric stretch|
|ν3 asymmetric stretching|
NO = not observed.