Mario,
>From the information that you just gave, it appears that the corundum 012 and
>siderite 012 are not well resolved causing more of the siderite 012 intensity
>to be attributed to the corundum 012 and an overestimation of corundum. If it
>is a microabsorption problem, you wouldn't get a
Mario,
You may want to check for the presence of solid solution in your siderite
(especially Ca and Mg). In my experience refining the PO in siderite with
measurable amounts of Ca or Mg correlates significantly with the occupancy if
the Fe/(Ca or Mg) ratio is not constrained to the true chemis
Could someone please describe an easy way to calculate the polarization
correction for the following beam path? Laboratory X-ray source -
monochromating confocal mirror - sample - curved area detector.
Many thanks.
Dipo Omotoso
Natural Resources Canada
CETC-Devon
#1 Oil Patch drive, Devon AB.
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
Could someone please suggest a source for purchasing kapton capillaries?
A search on the internet drew a blank.
Thanks.
Dipo Omotoso
You may find it useful to add a Cokb emmision line (1.620794 A) to the 7 CoKa
lines. Topas has a list of the CoKb lines. Using an instrument profile
standard such as LaB6 or Si, refine the emmission line area while fixing the
Lorentz half width to 0.6462 (value given for the CoKb emmission li
My limited experience with X-ray capillary measurements of ultra fine clay
minerals suggests that you could have significant preferred orientation along
the b* axis. It is actually a good way of determining aspect ratios in
phyllosilicates.
Dipo Omotoso
F
Leandro,
You probably should consult the references suggested by Alan Hewat and Reinhard
Kleeberg before you read anything into your "reasonable" Rwp. Kaolinite is
grossly over-parametized in your refinement strategy. If you are stuck with
TOPAS, you may want to contact Arnt Kern (Bruker) abo
Dear Andreas,
This may not be an option for your sample but grinding the sample to less
than 5 micron may help prevent fall out. In this size region, you may not
need to spin the sample to reduce texture effects.
Dipo Omotoso
-Original Message-
From: Andreas Leineweber [mailto:[EMAIL P
Does anyone have structural data (or references containing the data) for any
of the crystalline high density polyethylene polymers? I don't have access
to CSD.
Thanks,
Dipo Omotoso
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