Dear Friends,
Kindly look in to the manuscript.
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.74.214118 and
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.78.174106
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Strain-induced first-order orbital flip transition and coexistence of ch...
Low-temperature transmission electron microscopy and x-ray diffraction (XRD)
studies have been carried out on pe...
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Strain induced coexistence of monoclinic and charge ordered phases in ${...
Coexistence of charge-ordered (CO) and monoclinic (M) phases has been
investigated in ${\mathrm{La}}_{1\ensurema...
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On Monday, December 11, 2017, 4:35:57 PM GMT+5:30, Alan Hewat
<alan.he...@neutronoptics.com> wrote:
François, thank you for posting a summary of the suggestions you received, and
for posting your images to your web site, not to the whole list :-)
I urge people to reply to the whole group, not just privately, since such
questions are of general interest.
What you describe as different asymmetry is perhaps more a range of unit cell
dimensions; in particular there is a distinct higher angle shoulder even with
the white ZnO powder. A range of d-spacings could be due to different strain
distribution, but also due to different impurity distribution. Jon's question
about why the two samples have different colours is most relevant.
You would need a wider range of d-spacings (angular range) to sort this out.
And of course you could also try grinding and annealing your pellet.
Alan.
On 11 December 2017 at 10:54, François Goutenoire
<francois.gouteno...@univ-lemans.fr> wrote:
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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Nilesh Kulkarni.
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On Sat, Dec 9, 2017 at 1:31 AM, Joachim Breternitz
<joachim.breternitz@helmholtz- berlin.de <mailto:joachim.breternitz@
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.goutenoire@univ- lemans.fr
<mailto:francois.goutenoire@ 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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