The Strontianite Raman spectrum and its interpretation are presented below.
Strontianite sample data
| Description: | Strontianite mineral sample |
|---|---|
| Mineral: | Strontianite |
| RAMAN ID: | RAMAN5432 |
| Ideal chemistry: | SrCO3 |
| Source: | Grigore Cobălcescu Museum |
| Locality: | Drensteinfurt – Germany |
| Owner: | Department of Geology – Alexandru Ioan Cuza University of Iasi |
Strontianite sample image
Raman spectrum of Strontianite
Main Raman bands of Strontianite
| Wavenumbers (cm-1): | 1069vs, 700w, 242m |
|---|
Raman parameters
| 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 |
| 242 | 246 | T(Sr,CO3) |
| 700 | 701 711 |
ν4 symmetric deformation |
| NO | 855 | ν2 asymmetric deformation |
| 1069 | 1074 | ν1 symmetric stretch |
| 1445 1543 |
1408 1438 1447 |
ν3 asymmetric stretching |
NO = not observed.