Dear Apu,
If you use the Rietveld-based QPA you may assess the detection limit for a
phase from the estimated standard uncertainty of its weight (or volume)
fraction. In this case one should also take into account the fact that the
Rietveld standard uncertainties of QPA are underestimated about 2-3 times. To
have more realistic uncertainties you may use DDM:
http://sites.google.com/site/ddmsuite/
http://sourceforge.net/p/ddmsuite
Best regards,
Leonid
*******************************************************
Leonid A. Solovyov
Institute of Chemistry and Chemical Technology
660036, Akademgorodok 50/24, Krasnoyarsk, Russia
http://sites.google.com/site/solovyovleonid
*******************************************************
________________________________
From: Apu Sarkar <apusar...@gmail.com>
To: "Leoni, Matteo" <matteo.le...@unitn.it>
Cc: "rietveld_l@ill.fr" <rietveld_l@ill.fr>
Sent: Friday, May 2, 2014 3:41 AM
Subject: Re: Phase volume fraction
Yes, I meant detection limit.
In my sample I have a second phase which dissolves at some
temperature. I tried to identify the dissolution temperature using
XRD. With increasing temperature the peak intensity for the second
phase decreased. After certain temperature the peak disappeared. I
understand that is not exactly the dissolution temperature. There is a
limit of XRD to detect the phase.
Thanks
Apu
Department of Nuclear Engineering
NC State University
Raleigh, USA
On 5/1/14, Leoni, Matteo <matteo.le...@unitn.it> wrote:
> I guess you are talking about detection limit only, not quantification
> limit, right?
> The answer largely depends on your material (scattering power, domain size),
> tube (sampling volume) and counting time. I have seen cases where you can
> clearly see something below 0.1 wt% and cases where already the percent was
> off limits.
> Matteo
>
> -----------------------------------------------------------------
>
> Matteo Leoni, PhD
>
> DICAM
> University of Trento
> via Mesiano, 77
> 38123 Trento
> Italy
>
> Tel +39 0461 282416 Fax +39 0461 282672
>
> e-mail: matteo.le...@unitn.it
> ----------------------------------------------------------------
>
>
> -----Messaggio originale-----
> Da: rietveld_l-requ...@ill.fr [mailto:rietveld_l-requ...@ill.fr] Per conto
> di Apu Sarkar
> Inviato: giovedì 1 maggio 2014 22.24
> A: rietveld_l@ill.fr
> Oggetto: Phase volume fraction
>
> Hi,
> Can any one tell me what is the minimum phase volume fraction that can be
> detected by a laboratory X-ray diffractometer. In there any reference for
> this.
>
> I am using the new Empyrean from PANalytical.
>
> Thanks
> Apu
>
> Department of Nuclear Engineering
> NC State University
> Raleigh, USA
>
--
Apu Sarkar
Postdoctoral Research Scholar
Department of Nuclear Engineering
North Carolina State University
Raleigh
USA
Mobile: 919-561-9244
Website: https://sites.google.com/a/ncsu.edu/apu/
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