You can run into “interesting” behavior with metastable phases. I once ran a 
sample that gradually transformed from the “high temperature” structure to the 
“low temperature” under x-ray illumination. The two phases were red and yellow, 
so it was very obvious where the x-ray beam had illuminated the powder.

Andrew

*****************************************************

Dr. E. Andrew Payzant
Engineering Materials Group Leader
Chemical and Engineering Materials Division
Neutron Sciences Directorate
Oak Ridge National Laboratory

1 Bethel Valley Road
Bldg. 8600, Room B-438, Mailstop 6475
Oak Ridge, TN 37831-6475
USA

Phone: (865) 576-2164
cell: (865) 235-4981
email: payza...@ornl.gov
http:/neutrons.ornl.gov/cemd/<http://neutrons.ornl.gov/cemd/>
http://www.researcherid.com/rid/B-5449-2009
http://orcid.org/0000-0002-3447-2060
******************************************************


From: <rietveld_l-requ...@ill.fr> on behalf of Edward Laitila <ealai...@mtu.edu>
Reply-To: Edward Laitila <ealai...@mtu.edu>
Date: Monday, May 22, 2017 at 8:19 AM
To: Shay Tirosh <stiro...@gmail.com>
Cc: Rietveld list <rietveld_l@ill.fr>
Subject: Re: Sample damaging during XRD

There should be no damage but you may see a slit change in color where the beam 
hits the sample, a temporary change in the color center. I suggest running your 
generator at 45 kV and 35 mA you will get more intensity.

Cheers,
Ed

On Sun, May 21, 2017 at 12:21 PM, Shay Tirosh 
<stiro...@gmail.com<mailto:stiro...@gmail.com>> wrote:
Dear Rietveldrs

Do you know any damaging to sample that may happen during long scanning time 
say (3h).
Specifically in case the  x-ray source is Cu with Ka1+Ka2 that operates under 
40mA and 40kV and the sample is metal oxides

Please suggest on ref or book that elaborate on this topic.

Thanks

Shay




--
_________________________________________________

Dr. Shay Tirosh
Institute for Nanotechnology & Advanced Materials
Bar Ilan University
Ramat Gan, 52900
Israel
Phone: +972-(0)30-531-7320
Mobile: +972-(0)54-8834533<tel:+972%2054-883-4533>
Email: stiro...@gmail.com<mailto:stiro...@gmail.com>
_________________________________________________

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Dr. Edward A. Laitila
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Michigan Technological University
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