If CR1 is added as internal standard (20 mass%) to rock samples prior
to McCrone milling and flat powder samples for Bragg-Brentano are
carefully prepared, we did not observe severe preferred orientation
for the corundum, maybe as the powder is fine enough
(particles/aggregates ~ 1 µm before milling) to be randomly
distributed in the mixture within the gaps between the coarser mineral
grains.
But as Jim mentioned, the profile shape of CR1 is suboptimal, we need
a bimodal crystallite size distribution model to fit. Anyway, for
routine QPA the material is working.
Best regards
Reinhard
Zitat von Daniel Chateigner 20210513 <daniel.chateig...@ensicaen.fr>:
and not textured ?
Le 14/11/2023 à 12:56, Reinhard Kleeberg a écrit :
Hi Jim,
great news, would be good to have a corundum what can be modelled
with an easier profile shape model.
Best regards
Reinhard
Zitat von "Cline, James P. Dr. (Fed)" <james.cl...@nist.gov>:
Hi all,
SRM 676a consisted of Baikowski CR1. This material is of a
non-ideal crystallite size distribution: quite broad with tales to
large crystallites. SRM 676b was custom made for us by Baikowski
with a more uniform crystallite size distribution in the 200 nm
region. We are working on the certification, rather complex, see:
doi:10.1107/S0108767311014565 . It seems that modern beamlines
don't favor the large specimen size needed for our experiments.
We have good data from one source, we are looking for some from
another as we like to see results from more one machine.
Jim
James P. Cline
Materials Measurement Science Division
National Institute of Standards and Technology
100 Bureau Dr. stop 8370 [ B113 / Bldg 217 ]
Gaithersburg, MD 20899-8523 USA
james.cl...@nist.gov
https://www.nist.gov/people/james-p-cline (301) 975 5793
-----Original Message-----
From: rietveld_l-requ...@ill.fr <rietveld_l-requ...@ill.fr> On
Behalf Of Reinhard Kleeberg
Sent: Monday, November 13, 2023 1:51 AM
To: rietveld_l@ill.fr
Subject: Re: NIST-676a
We are using Baikowski CR1
https://www.baikowski.com/en/serie/cr/ Not certified but maybe
identical with SRM676a. Scale factors and cell parameters found to
be within the errors. Profile shape shows similar features (also
not an ideal material).
Best regards
Reinhard
Zitat von Matthew Rowles <rowle...@gmail.com>:
Hi Matej
You can try IMS135 - high purity alumina.
https://imst/
andards.com.au%2Fproducts%2F&data=05%7C01%7Cjames.cline%40nist.gov%7C2
d945a33db074232a69808dbe414ca9a%7C2ab5d82fd8fa4797a93e054655c61dec%7C1
%7C0%7C638354550207433666%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAi
LCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=r
MK%2BzDuAMv2q7U6fCpu38mzuqIrTdCiQfNDPSmB%2BQZk%3D&reserved=0
It was certified against some SRM676a we already had in the lab.
Matthew
On Sun, 12 Nov 2023 at 22:42, Matej Dolenec <smu...@siol.net> wrote:
Dear all,
I am trying to buy NIST-676a but unfortunately unsuccessful ... I was
trying to find it on NIST, ALDRICH and other sites but the standard
is out of stock. Does anybody has any information if this standard
will be available soon and where? If not, which standard should I use
instead of NIST-676a? I was using this standard for amorphous
phase identification.
Regrads, Matej
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Daniel Chateigner
Professeur Normandie Universite
http://www.ecole.ensicaen.fr/~chateign/danielc/
----------------------------------------------------------------------
Editor: "Combined Analysis", Wiley-ISTE:
http://eu.wiley.com/WileyCDA/WileyTitle/productCd-1848211988.html
Workshops on Combined Analysis:
http://www.ecole.ensicaen.fr/~chateign/formation/
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Address:
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Open Databases:
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Crystallography Open Database (COD): http://www.crystallography.net/cod/
Theoretical (TCOD):
http://www.crystallography.net/tcod/
Predicted (PCOD):
http://www.crystallography.net/pcod/
Raman Open Database (ROD): solsa.crystallography.net/rod/
Full-Profile Search-Match (FPSM): cod.iutcaen.unicaen.fr/
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Dr. R. Kleeberg
Mineralogisches Labor
Brennhausgasse 14
D-09596 Freiberg
Tel. ++49 (0) 3731-39-3244
Fax. ++49 (0) 3731-39-3129
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