I need the CIF file of Na2CO3 having space group C2/m with cell parameters (a=9.0107, b=5.2443, c=6.3053, alpha=90, beta=97.3490 and gamma=90) and cell volume of 295.50. This file is present in COD and AMCSD but it has incomplete information i.e. scattering coefficient of C is missing, which is causing problem in Rietveld refinement. Does anyone can provide the CIF file or the source from where I can find the complete detail of this system.
Hello. This can be more complicated. Apparently it is the gamma phase of Na2CO3 and it is said to be an incommersurately modulated structure. Some structural data is available for download at http://rruff.geo.arizona.edu/AMS/amcsd.php, there type "natrite" in the mineral field and search.
When it is an incommensurately modulated structure, it will work only approximately in most Rietveld's software.
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