>From my experience some transition metal oxides, like MoO3, WO3 etc, turns slowly blue under X-tay, assumedly due to metal reduction. Peter Zavalij
On May 22, 2017 10:00 AM, "Payzant, E. Andrew" <payza...@ornl.gov> wrote: > 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 > <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> 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 <+972%2054-883-4533> > > Email: stiro...@gmail.com > > _________________________________________________ > > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <alan.he...@neutronoptics.com > > > Send commands to <lists...@ill.fr> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on http://www.mail-archive.com/ > rietveld_l@ill.fr/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > > > > > -- > > Dr. Edward A. Laitila > > Senior Research Engineer/Scientist II/Adjunct Assistant Professor > > Michigan Technological University > > Dept. of MSE > > Room 628 M&M Building > > (906) 369-2041 > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > Please do NOT attach files to the whole list <alan.he...@neutronoptics.com > > > Send commands to <lists...@ill.fr> eg: HELP as the subject with no body > text > The Rietveld_L list archive is on http://www.mail-archive.com/ > rietveld_l@ill.fr/ > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > > >
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Please do NOT attach files to the whole list <alan.he...@neutronoptics.com> Send commands to <lists...@ill.fr> eg: HELP as the subject with no body text The Rietveld_L list archive is on http://www.mail-archive.com/rietveld_l@ill.fr/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
