, 24 Jan 2007 12:51:57 -0500
To: rietveld_l@ill.fr
Subject: Re: Strange peaks from grainy Si
I'll mail you some fine Si powder if you send me your address.
My best guess is that you have a relatively big lump of Si in
your sample that happens to be lined up to make
FAX: (865) 574-3940
web: http://html.ornl.gov/dtpgrp/staff/payzant.html
From: [EMAIL PROTECTED]
Reply-To: rietveld_l@ill.fr
Date: Wed, 24 Jan 2007 12:51:57 -0500
To: rietveld_l@ill.fr
Subject: Re: Strange peaks from grainy Si
I'll mail you some fine Si powder
... The problems bothering me are
the measured peak is much wider than the simulation
Peak widths should be 400 microns (your beamsize) divided by 3.5 cm
(your distance) in radians, which is about 180*0.4/3.5/PI = 6.5 degrees.
HTH,
Jon
To: rietveld_l@ill.fr
Subject: Re: Strange peaks from grainy Si
I'll mail you some fine Si powder if you send me your address.
My best guess is that you have a relatively big lump of Si in
your sample that happens to be lined up to make a bright spot
from
I'll mail you some fine Si powder if you send me your address.
My best guess is that you have a relatively big lump of Si in your sample
that happens to be lined up to make a bright spot from the bremstrahlung
part of the spectrum. It happens to meet some Si Bragg reflection
condition for
Oak Ridge, TN, 37831-6064
ph: (865) 574-6538 FAX: (865) 574-3940
web: http://html.ornl.gov/dtpgrp/staff/payzant.html
From: [EMAIL PROTECTED]
Reply-To: rietveld_l@ill.fr
Date: Wed, 24 Jan 2007 12:51:57 -0500
To: rietveld_l@ill.fr
Subject: Re: Strange peaks from grainy Si
I'll mail you some
From: Andrew Payzant [mailto:[EMAIL PROTECTED]
Sent: Wed 24/01/2007 12:58 PM
To: Rietveld list
Subject: Re: Strange peaks from grainy Si
Peter,
That is my guess too - either additional (weak) characteristic lines such as
Mo-K beta, or contaminant lines such as W
Thank you very much, Prof. Stephens, my mailing address is bellow.
Congwu Cui
*
Department of Physiology and Biomedical Engineering
Alfred 2-404, Mayo Clinic College of Medicine
200 First Street SW
Rochester MN 55905
phone:
PROTECTED]
Sent: Wed 1/24/2007 1:05 PM
To: rietveld_l@ill.fr
Subject: RE: Re: Strange peaks from grainy Si
For some reason the original email never made it to me so I can't see the data
- so apologies if this is way off base. However, it's not impossible for
perfect single crystal material
Congwu,
If you can move the detector the radius of the silicon rings will change
according to the distance and Bragg angles. Moving the sample might be easier
for the same check. Does your spurious ring move so that you can trace it back
to a point inside the sample? Could it come from the
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