We have positive experience with commercial ZnO pigments or chemicals,
heated to 700°C for about 2 hours in air for recrystallisation of the
amorphous ZnO or the spurious Zn carbonates/hydrates to get nearly 100%
crystalline ZnO. In 1:1 mixtures of the best NIST corundum, we found no
Hi!
You can try with ZnO, annealed at 950ºC, 72 h h, ( from works of Langford
and Louêr)
best wishes
Miguel Hesiquio
Hi All,
Does anyone know an appropriate source of standard reference materials for
a
line profile standard, like NIST SRM 660a (LaB6) - other than NIST, as
they
are out of
Thanks Reinhard and all for quick and comprehensive answers. It appears that
we do have microabsorption effect as Rietveld content deviates from expected
in accordance with absorption coefficients and there is no simple fix for
that but take proper precautions in sample preparation and select
Ross,
The link to The Gem Dugout X-ray Diffraction Products is
http://www.thegemdugout.com/products.html.
The provide several reference specimens for affordable price, e.g. LaB6 -
$10/g.
And other diffraction products.
Peter
Dr. Peter Y. Zavalij
Director, X-ray Crystallographic Laboratory
Hi all,
We expect to have SRMs 640d 660b available by no later then November 2008.
SRM 676a will available in a ~month.
I regret the difficulty that is being caused by this lapse; we are
taking measures to prevent them from recurring.
Regards,
Jim
At 09:50 PM 11/15/2007, you wrote:
Hi
For quantitative analysis the flat-plate transmission geometry is much
more preferable as it is free of the microadsorbtion problem. Of
course, resolution is not so easily achievable in this geometry, but
one may use synchrotron at last.
Best regards,
Leonid Solovyov
Thanks Reinhard and all for
Flat-plate transmission? Is this a good example of an oxymoron or am I missing
a trick here? Shome mishtake shurely.
Martin Vickers
Subject: RE: Amorphous content
Date: Fri, 16 Nov 2007 06:33:49 -0800
From: [EMAIL PROTECTED]
To: rietveld_l@ill.fr
For quantitative analysis the
Dear shishir,
You probably would like to take a look a the following (open access) paper
published last February in Journal of Applied Crystallography:
http://journals.iucr.org/j/issues/2007/01/00/issconts.html
Hope this helps.
Leo
Dr. Leopoldo Suescun
Postodoctoral Appointee
Materials
Could someone please suggest a source for purchasing kapton capillaries?
A search on the internet drew a blank.
Thanks.
Dipo Omotoso
Could someone please suggest a source for purchasing kapton
capillaries? A search on the internet drew a blank.
Try polyimide rather than kapton. We have used MicroLumen as a
vendor: http://www.microlumen.com/
Brian
We use thin-walled heat shrink PET tubing from advanced polymers. Fewer
peaks in the low angle region and it comes in a colorless/ clear form.
Joe Reibenspies
Brian H. Toby wrote:
Could someone please suggest a source for purchasing kapton
capillaries? A search on the internet drew a
Dear Ross,
We are working in the preparation of standard materials for XPD
equipment alignment / calibration and also for obtaining instrumental
breadth for line profile analysis (Rietveld, Warren-Averbach etc.).
In our opinion a simple and good choice is high purity ytria (Y2O3)
treated
Thank you for your suggestions.
Dipo Omotoso
From: Brian H. Toby [mailto:[EMAIL PROTECTED]
Sent: Friday, November 16, 2007 3:04 PM
To: rietveld_l@ill.fr
Subject: Re: Kapton capillaries
Could someone please suggest a source for purchasing kapton
Dear Rietvelders
Does anyone know whether the scattering contrast of Fe and Cu is large enough
to refine their occupancies from a single X-ray powder pattern or would
multiple wavelength patterns help?
Thanks for your advice.
Regards
Franz Werner
--
Pt! Schon vom neuen GMX
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