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Natrite: Crystal structure | Sample photo | Raman spectrum | Interpretation | References

Crystal structure of Natrite

Formula:

Na2CO3

Crystal Data:

Crystal System: Monoclinic.

Point Group: 2/m

Cell Data:

Space Group: C 2/m, a = 8.906, b = 5.238, c = 6.045, Z = 4

Using the mouse (click here for more information)

Density (calc.) = 2.54 and V = 276.82 Å3
Element color: Na, C, O
Natrite sample
Natrite

Synthetic sample.




Click image to enlarge
Raman spectrum and vibrations of Natrite
Element color: C, O Toggle Grid Toggle Coordinates Reverse Spectrum

Click to in the Raman spectrum. To see the vibrations click on one of them (highlight region) and it (the selected vibration) will appear on the right side of the Raman spectrum.
Below spectra are various settings, and other vibrations of natrite (which are not present in this spectrum).
You have the possibility to zoom in the spectrum by selecting a spectral region you need to be increased (along axis x); to zoom keep the left mouse-click continously pressed, drag (to left or to right) and release the left button. To return to the initial size spectrum, press the right click on the spectrum -> Zoom -> Reset View.
Model type:
Sticks Ball-and-Sticks (1) Ball-and-Sticks (2) CPK (Spacefill)

Orientation:
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CO3 polyhedra on CO3 polyhedra off 		Vibrations:
702 cm-1 - ν4b (E') 1080 cm-1 - ν1 (A'1) 1429 cm-1 - ν3a (E')

Vibration on Vibration off 		Download spectrum:
Raman spectrum .txt Raman spectrum .spc


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Interpretation of Raman spectrum of Natrite

For natrite, the most intense Raman band, corresponding to the ν1 symmetric stretching vibration of the carbonate group, is at 1080 cm-1.

The 1429 cm-1 peak corresponds to the ν3 normal mode and line of 702 cm-1 is attributed to the ν4 symmetric bending mode. The Raman spectrum of Na2CO3 shows only one line of lattice mode, at 290 cm-1.


Buzgar et al., 20091 Beny, 1988 Assignment
290 111, 131, 149, 171, 189 T(Na,CO3)
702 701 ν4 symmetric deformation
ν2 asymmetric deformation
1080 1069
1079		 ν1 symmetric stretching
1429 1421
1431		 ν3 symmetric deformation
References

• The Mineralogy Database [link]

• Crystal data (.cif file) from the American Mineralogist Crystal Structure Database [link]

• 1BUZGAR N., APOPEI A. I. (2009) - The Raman study on certain carbonates. Analele Stiintifice ale Universitatii “Al. I. Cuza” - Iasi, Tome 55, issue 2, 97-112 [link]

• BENY C. (1988) - Societe Francaise de Mineralogie et de Cristallographie - Base donnees de spectres Raman. Natrite [link]