With the appropriate sample and high-resolution synchrotron powder diffraction data, you can do even better than 0.1 wt%. Here at the APS beamline 11-BM, we've managed to perform quantitative refinements on a suspected very dilute ZrB2 impurity in the NIST SRM LaB6 660a powder sample, at a level of 0.068 wt% ZrB2. The accuracy of this value is supported by complimentary XRF data showing a calibrated Zr concentration of 617 ppm in the LaB6 sample.
These data (from J. Faber) are currently in press as proceedings from the 2013 DXC meeting. It would be difficult to reproduce this level of sensitivity with more 'real world' samples and conditions - but it shows in principle what can be achieved. Especially if you submit samples for the free rapid access measurement program here at the APS beamline 11-BM. http://11bm.xray.aps.anl.gov/users_new.html [please forgive the flagrant advert!] Matthew Suchomel Advanced Photon Source Argonne National Laboratory > 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 > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> > Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text > The Rietveld_L list archive is on > http://www.mail-archive.com/rietveld_l@ill.fr/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ >
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