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[sdpd] Rietveld afinement



dear;
I have an organic powder, I want refine this powder dy Rietveld methode, how time I must put for this analysis.
you must known the cristallographic system : monoclinic ( space group is :P2/1)
 
please send me your answer.
thanks.
 
Dr Bendenia souhila
laboratoir de cristallographie.
universitée de mostaganem. algérie


Luca Lutterotti <Luca.Lutterotti...@ing.unitn.it> wrote:
If you need to do the analysis without internal standard and no  
calibration curve you may look at:
http://www.ing.unitn.it/~luttero/Publications/EPDIC_V/ 
silicate_glass.html
reference:
Lutterotti et al., Mat. Sci. Forum, 1998, 278, 87-92.

Depends on the amorphous type it may work for you. Programs for the  
method: Maud or Rietquan, but with some effort it works also with other  
Rietveld programs.

      Luca Lutterotti

On Feb 17, 2005, at 9:11, bixam manthri wrote:

>
> Dear Sir,
>
> Thanks for your reply,
>
> Is there any method for the same without using any Internal reference  
> standerd.
>
> Without establishing a calibration curve can we simply calculate the  
> percentage of cystallinity in a sample, having the diffractogram.
>
>  Physically can we do this??: calculating  the Area of each individual  
> peaks seperately and the net area of the total diffractogram.
>
> %crystallinity= 100* sum of area of each individual peak/ Net area of  
> the Diffractogram.
>
> %crystallinity= 100* C/ A+C
>  where   C= net area of crystaline peaks
>              A+C= Net area Of the Diffractogram.
>
> Please confirm me how far this method is accepted.
>
> 
>
>
>
>
> Armel Le Bail <alb...@cristal.org> wrote:
>
>> Iam an working on the percentage of crystallinity calculation using  
>> the
>> powder XRD pattern. Could any one can give me some documentation or  
>> the
>> reference information.
>
> If you do not have access to the Web of Knowledge nor
> direct access to other commercial systems, then try
> the new Scholar Google search engine :
>
> 135 references obtained by a search with keywords
> "crystallinity percentage X-ray":
> http://scholar.google.com/scholar? 
> hl=en&lr=&q=crystallinity+percentage+X-ray&btnG=Search
>
> Anyway, I am afraid that this kind of estimation needs
> for a calibration curve established from well known mixtures
> of crystalline and amorphous phases.
>
> And the question is : is there really a clear separation between
> these two parts when the crystalline part becomes highly
> defective ? So, be prudent with your results...
>
> Best wishes,
> Armel
>
> PS - Other search for references possible at :
> INGENTA: http://www.ingentaconnect.com/
> INIST : http://www.inist.fr/
>
>
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