Hello All -
I seek help finding the amorphous content of an iron ore sample. The problem
might be my refinement. This sample was spiked with 9.4% corundum, and contains
~30% goethite, ~20% hematite, and a few percent quartz. My colleague conducted
a refinement in JADE and got an estimate of
Overlooking old good tricks is a mistake, SURELY.
Leonid Solovyov
>Flat-plate transmission? Is this a good example of an oxymoron or am I
> missing a trick here? Shome mishtake shurely.
>
>Martin Vickers
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 quantit
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
21
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http://www.chem.umd.edu/facility/xray/
-Original Message-
From: Reinhard Kleeberg [mailto:[EMAIL PROTECTED]
Sent: Friday, November 16, 2007 3:14 AM
To: rietveld_l@ill.fr
Subject: Re: Amorphous content
We have positive experience with commercial ZnO pigment
our experience, the mixing of the standard ZnO and the sample powders
can cause problems like forming aggregates of the both materials. For
example, if larger aggregates of ZnO persist in the sample one can get
"negative" amorphous content because of the underestimation of the ZnO
b
At first glance it looks like a classic microabsorption problem, but I
don't have the linear absorption coefficients to hand. Using an
internal standard with a too small absorption will tend to over-estimate
the amorphous content. Ce versus Zn is a pretty big contrast for CuKa,
even i
Hi,
I am trying to determine amorphous content using Rietveld refinement and
internal standard. However resulting content of amorphous phase is really
unrealistic.
Moreover testing the method using standards with known amorphous content
does not clarify the situation. For example ZnO (NIST, 95
