Dear Blaise,
A chi^2 of 500 means that on average your model is off by 500 sigma, or
500*500=25 counts. This usually means some technical detail has gone
wrong in file formats or weights.
If you don't manage to figure out the problem then if you can post your
refinement somewhere I am su
vyov [mailto:[EMAIL PROTECTED]
Sent: Thursday, 18 September 2008 14:34
To: rietveld_l@ill.fr
Subject: Re: Beginer problems, difficulty charecterizing our diffractometer...
Dear Blaise,
The strong peak asymmetry may result from high-divergence Soller slits
installed in your instrument. You
www.geocities.com/l_solovyov
***
--- On Wed, 9/17/08, Mibeck, Blaise <[EMAIL PROTECTED]> wrote:
> From: Mibeck, Blaise <[EMAIL PROTECTED]>
> Subject: Beginer problems, difficulty charecterizing our diffractometer...
> To: rietveld_l@ill
There is a tutorial on the CPDW webpage at http://www.cins.ca/cpdw/notes.html
on using annealed cubic Y2O3 to determining polarisation via GSAS.
It is cubic and has a good peak density over the range of 2-theta. Y2O3
gives a stable and robust refinement result for polarisation .
Lachlan
>
ailto:[EMAIL PROTECTED]
Sent: Wed 9/17/2008 12:22 PM
To: rietveld_l@ill.fr
Subject: Beginer problems, difficulty charecterizing our diffractometer...
I am re-learning GSAS to bring Rietveld to my department (for the first time).
We have an old Phillips Xpert.
I am trying to refine a q
From what I have been told and led to believe, Chi^2 isn't the be all
and end all. This will really depend upon your counting statistics. Pay
more attention to your Rp, Rwp and what your fit actually looks like.
Also, try performing a Le Bail fit to your data and see what Chi^2 you
get. This sh
I am re-learning GSAS to bring Rietveld to my department (for the first
time). We have an old Phillips Xpert.
I am trying to refine a quartz standard to acquire my profile and instrument
parameters for this instrument and have yet to get my Chi^2 below 500. The
instrument is not in my direc
