Dear Colleague,
We are writing to request your suggestions for invited speakers for the Focus
Topic “Discovering emergent phenomena and magnetism with neutron and x-ray
powder diffraction” at the 2014 American Crystallographic Association Meeting
in
Albuquerquehttp://www.amercrystalassn.org
ICNX-2009 is an International Conference on Neutron and X-Ray Scattering
to be held in Kuala Lumpar, Malaysia. Dr A. Aziz of Nuclear Malaysia has
asked me to announce a change in the date of ICNX-2009 to 29 June-1 July
2009. I have put a copy of the second circular on:
http://icsd.ill.fr/ICNX
Dr A. Aziz of Nuclear Malaysia asked me to publicise ICNX-2009, an
International Conference on Neutron and X-Ray Scattering to be held in
Kuala Lumpar, Malaysia on June 22-24, 2009. I have put a copy of the first
announcement on: http://icsd.ill.fr/ICNX2009.pdf
For further information and pre
On Sun, 9 Mar 2008, Alan Hewat wrote:
Precision of CW neutron machines is
frequently not so high as X-ray diffractometers, but this problem is
masked in Rietveld by extremely (artficialy) low e.s.d.'s of lattice
parameters.
Hmm?? With CW neutron machines, the wavelength is sometimes not
Dear All,
I have a philosophic question for you: the structure obtained by NPD are
better than the ones found by XRPD?
I explain a little bit more my question, I studied a MgAlFeO4 spinel both by
NDP and XRPD from RT to 1000°C. The O coordinate it is different for two
data set (0.2581
The advantage of neutron powder diffraction is that the scattering power
of light atoms like oxygen is as great as for heavy atoms; for X-rays, the
heavy atoms dominate, so errors for the light atoms will be greater. A
second advantage is that with neutrons you have a larger sample, so a
better
Hello,
do not mind statistical precision (your error at the oxygen coordinate)
and look at the errors (e.s.d.) of the interatomic distances, especially
of those between bonded atoms. Precision of CW neutron machines is
frequently not so high as X-ray diffractometers, but this problem is
Davide,
Did you check for extinction and preferred orientation? Otherwise what
does a combined fit give? The difference of about 10 sigma suggests a
remaining systematic error. What is the impact of refining anisotropically?
Good luck,
Jon
Davide Levy wrote:
Dear All,
I have a
Davide,
Could you perform Rietveld refinement using combined neutron and x-ray data?
This would increase accuracy and the question what is better would
disappear. Basically all you need is both data done at the same temperature.
Also look at neutron and x-ray scattering factors. The neutron
are determined.
Of course, if you can collect both neutron and x-ray data, especially
synchrotron data, on similar samples at the same temperature, you may
improve accuracy by performing a combined refinement, but that is often
not possible. And again, it was not the question - Neutron or X-ray
Hi,
To what has already been said I think the two round-robin articles are a
must-read about this issue, as they compare refinement of neutron and X-ray
data for a given (simple) compound. They are a bit old, especially by today's
synchrotron standards, but are still very interesting
The Neutron and X-ray Scattering Group of the Materials Science Division at
Argonne National Laboratory is seeking candidates for a staff scientist in
the field of neutron and x-ray diffraction. We are looking for an
experienced scientist with a distinguished record of scattering research
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