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Re:RE: [sdpd] Assistance
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<p>>They are about 100 nanometer? <br>
in general, XRD can determine the crystal size in the range of 1nm-100nm. So you should check your data carefully under TEM or SEM, if possible.<br>
<br>
There are several method to determine crystal size by XRD tech., The Scherrer Equation, W-H, Fourier, and Rietveld. (see published journal - crystal size determination round robin)<br>
<br>
Generally, two mehods W-H and Rietveld can be used in most software.<br>
<br>
>How to preceed data in specific software?<br>
Maybe you should check the help file or E-mail Panalytical application expert.<br>
<br>
Best,<br>
Xu Jun<br>
<br>
At 2011-09-22 13:01:29,JB <<a href="mailto:javaedot2%40yahoo.com";>javaedot2...@yahoo.com</a>> wrote:<br>
<br>
<br>
Thanks Wang, the particles are Calcite, probably rhombohedral, they are about 100 nanometer, but I needed to know how to proceed with X'pert HighScore Plus to determine the particle size after I have got the XR diffraction patterns.<br>
<br>
Thanks in anticipation<br>
<br>
Make the world a better place to live in<br>
<br>
--- On Wed, 9/21/11, Xiaodong Wang <<a href="mailto:iangie%40126.com";>iangie...@126.com</a>> wrote:<br>
<br>
From: Xiaodong Wang <<a href="mailto:iangie%40126.com";>iangie...@126.com</a>><br>
Subject: RE: [sdpd] Assistance<br>
To:<a href="mailto:sdpd%40yahoogroups.com";>sdpd...@yahoogroups.com</a><br>
Date: Wednesday, September 21, 2011, 8:39 AM<br>
<br>
Is your particle calcite?<br>
<br>
Have you checked SEM images of these powder to see the extend of platy shape?<br>
<br>
Just be careful about the preferred orientation effect when using Bragg-Brentano geometry.<br>
<br>
If not, then you can use peak FWHM to estimate the coherent scatter dimension.<br>
<br>
Yours Sincerely<br>
<br>
-------------------<br>
<br>
Xiaodong (Tony) Wang<br>
<br>
Department of Imaging and Applied Physics<br>
<br>
Curtin University<br>
<br>
From:<a href="mailto:sentto-1052548-2737-1316617777-iangie%3D126.com%40returns.groups.yahoo.com";>sentto-1052548-2737-1316617777-iangie=126.com...@returns.groups.yahoo.com</a> [mailto:<a href="mailto:sentto-1052548-2737-1316617777-iangie%3D126.com%40returns.groups.yahoo.com";>sentto-1052548-2737-1316617777-iangie=126.com...@returns.groups.yahoo.com</a>] On Behalf Of JB<br>
<br>
Sent: 2011å¹´9æ??21æ?¥ 23:10<br>
<br>
To:<a href="mailto:sdpd%40yahoogroups.com";>sdpd...@yahoogroups.com</a><br>
<br>
Subject: [sdpd] Assistance<br>
<br>
Hello guys<br>
<br>
Can anyone help me, I need to calculate the particle size of a given CaCO3 powder, how do I proceed (practically) using HighScore Plus. I have the diffraction pattern.<br>
<br>
Thanks in anticipation.<br>
<br>
Make the world a better place to live in<br>
<br>
--- On Tue, 9/20/11, L_Solovyov <<a href="mailto:l_solovyov%40yahoo.com";>l_solovyov...@yahoo.com</a> <mailto:l_solovyov%40yahoo.com> > wrote:<br>
<br>
From: L_Solovyov <<a href="mailto:l_solovyov%40yahoo.com";>l_solovyov...@yahoo.com</a> <mailto:l_solovyov%40yahoo.com> ><br>
<br>
Subject: [sdpd] Re: question<br>
<br>
To:<a href="mailto:sdpd%40yahoogroups.com";>sdpd...@yahoogroups.com</a> <mailto:sdpd%40yahoogroups.com><br>
<br>
Date: Tuesday, September 20, 2011, 8:07 PM<br>
<br>
> What will be the real errors in this case?<br>
<br>
The uncertainties (sigmas) of the corrected profile intensities Icor are:<br>
<br>
sigma(Icor) = sigma(Io)*Icor/Io = Icor/sqrt(Io)<br>
<br>
where Io is the observed uncorrected profile intensity.<br>
<br>
*******************************************************<br>
<br>
Leonid A. Solovyov<br>
<br>
Institute of Chemistry and Chemical Technology<br>
<br>
660049, K. Marx 42, Krasnoyarsk, Russia<br>
<br>
<a href="http://sites.google.com/site/solovyovleonid";>http://sites.google.com/site/solovyovleonid</a><br>
<br>
*******************************************************<br>
<br>
--- <a href="mailto:Insdpd%40yahoogroups.com";>Insdpd...@yahoogroups.com</a> <mailto:sdpd%40yahoogroups.com> , Radu Baies <radu.baies...@...> wrote:<br>
<br>
><br>
<br>
> Dear All,<br>
<br>
> Our diffractometer is running with a variable divergence slit. The<br>
<br>
> data can be corrected for this using HighScore program.<br>
<br>
> In FullProf the errors are calculated assuming a Poisson distribution.<br>
<br>
> What will be the real errors in this case?<br>
<br>
> Thanks<br>
<br>
><br>
<br>
[Non-text portions of this message have been removed]<br>
<br>
[Non-text portions of this message have been removed]<br>
<br>
[Non-text portions of this message have been removed]<br>
<br>
[Non-text portions of this message have been removed]<br>
<br>
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