Hi Josh
Do you mean a standard for the peak positions, to correct for the sample shift? If so, then I'd say it depends on whether the mesh and sample are exactly on the same plane. And what type of in-situ? If it is temperature, then they should ideally have similar thermal expansion behavior as well. I would suggest you to add another sprinkle of a well-known powderous standard, such as silicon powder, to one measurement. Sure, you will have a three-phase refinement ahead of you, but silicon gives very distinct lines and its thermal expansion is well known. That'll tell you also how well the aluminum is behaving as a standard. Best, Arto On Fri, May 15, 2015 at 4:32 PM, Josh Kim <joshkim....@gmail.com> wrote: > Dear Rietvelds, > > I’d appreciate some advice related to precision lattice parameter > calculation: I am currently performing in-situ measurements on a powder > sample which is deposited onto an aluminum mesh support. Due to the setup a > 3-axis stage is used to ‘align’ the sample in the diffractometer, however > my optimization of the sample alignment has simply been done to maximize my > signal to noise ratio. My question then becomes… is it feasible/reliable to > utilize the aluminum peaks (or even the beryllium peaks from my in-situ > cell window) from my support as an internal standard ?? (even though that > itself is not in the same plane as my sample) > > My initial thoughts would be that I am not able to do so without > introducing further error into my result, but am curious if anyone else has > had a similar experience. > > Thanks, > Josh > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 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/ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
