[sdpd] Rietveld afinement

[bendenia souhila <bensouhila2000...@yahoo.fr>]

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/
>
>
> Yahoo! Groups SponsorADVERTISEMENT
> document.write('');
>
> ---------------------------------
> Yahoo! Groups Links
>
>    To visit your group on the web, go to:
> http://groups.yahoo.com/group/sdpd/
>
>    To unsubscribe from this group, send an email to:
> sdpd-unsubscribe...@yahoogroups.com
>
>    Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service.
>
>
>             
> ---------------------------------
> Do you Yahoo!?
>  Yahoo! Search presents - Jib Jab's 'Second Term'
>
> [Non-text portions of this message have been removed]
>
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
>
>
>


Yahoo! Groups SponsorADVERTISEMENT
document.write('');

---------------------------------
Yahoo! Groups Links

   To visit your group on the web, go to:
http://groups.yahoo.com/group/sdpd/
  
   To unsubscribe from this group, send an email to:
sdpd-unsubscribe...@yahoogroups.com
  
   Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. 


		
---------------------------------
 Découvrez le nouveau Yahoo! Mail : 250 Mo d'espace de stockage pour vos mails !
Créez votre Yahoo! Mail

[Non-text portions of this message have been removed]



------------------------ Yahoo! Groups Sponsor --------------------~--> 
What would our lives be like without music, dance, and theater?
Donate or volunteer in the arts today at Network for Good!
http://us.click.yahoo.com/TzSHvD/SOnJAA/79vVAA/UIYolB/TM
--------------------------------------------------------------------~-> 

 
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/sdpd/

<*> To unsubscribe from this group, send an email to:
    sdpd-unsubscribe...@yahoogroups.com

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/