Thank everyone for all the answers (on and off)
If I can resumed all the ideas :
Question about the darkness of the pellets (could it be reduction
process ?) I should asked the student about the sintering. The ZnO is
doped with Ti/Al and Mg.
Question about the peak shift : it is true than even some nice
preparation to put the sample in the plane the peak shift could be due
to height difference.
Question about other geometrical aberration : I will try to do more
measurements with smaller Soller (0.01rad), a smaller mask 10mm and I
will fixed the sample irradiated length with the Automatic Divergent
Slit system.
Question about strain : If I am making the hypothesis that the all
sample is one phase without problem of reduction then the strain
possibility seems interesting for me.
I will give you more informations after new measurements.
Cheers, François
Le 09/12/2017 21:52, hd yahoo a écrit :
Le 12/9/2017 à 7:49 PM, N. Dragoe a écrit :
Hi
ZnO can also have a darker colour if it is obtained by thermal
treatment in low pressure of oxygen.
In my opinion, if all else is correct -I mean normal Soller slits,
correct height,… etc- there might be sample strain.
Regards
N
Le 9 déc. 2017 à 16:25, Nilesh Kulkarni <nil...@tifr.res.in
<mailto:nil...@tifr.res.in>> a écrit :
yes that is surprising. pellet is black while powder is white. ZnO
pellet should also have been white.
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With Regards,
Nilesh Kulkarni.
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On Sat, Dec 9, 2017 at 1:31 AM, Joachim Breternitz
<joachim.bretern...@helmholtz-berlin.de
<mailto:joachim.bretern...@helmholtz-berlin.de>> wrote:
Hi,
Given the fact that the peaks are shifted between the powder and
the pellet measurement, could it maybe be due to a height error
of the pellet during the measurement?
Best,
Joachim.
Am 8. Dezember 2017 20:48:35 MEZ schrieb Jon Wright
<wri...@esrf.fr <mailto:wri...@esrf.fr>>:
Hello,
In the photo, the pellet is black and the powder is white.
Why is that?
Best
Jon
On December 8, 2017 3:35:20 PM GMT+01:00, "François
Goutenoire" <francois.gouteno...@univ-lemans.fr
<mailto:francois.gouteno...@univ-lemans.fr>> wrote:
Dear Rietveld users,
We observe an unusual asymmetric peak shape on pellet and
not when the sample has been crushed in powder.
This asymmetry is observed even at high 2theta angle. I
would like to known if someone has an explanation ?
I have put the data in the link here after
http://perso.univ-lemans.fr/~fgouten/Asymmetry
<http://perso.univ-lemans.fr/%7Efgouten/Asymmetry>
Best Whishes, François Goutenoire
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Dear All,
2Theta shift is probably due to high adjustment. As all peaks have
this asymmetry profile it could be a contribution of low particle size
Zn-O phase, the white ZnO I think its a commercial one. Try to modify
the sample orientation and beam incidence the asymmetry in this case
will remain present.
regards,
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Département des Oxydes et Fluorures
Institut des Molécules et des Matériaux du Mans
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FRANCE
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