Dear Leonid. You have a point, but they also have other evidence for lower symmetry. (Personally I have for long believed, secretly, that all structures were at best triclinic, and that everything else was just an average :-) I know you like to be provocative, but let's not start a little war over this. Normally the referees and journals, together with the authors, are responsible for what they publish.
Best wishes, Alan. On 9 May 2015 at 19:02, Leonid Solovyov <l_solov...@yahoo.com> wrote: > Regarding the query of Leopoldo Suescun: > ”Shouldn´t the IUCr take action and try to influence the journals that > frequently publish x-ray data (as a complementary characterization > technique but that determines the validity of other results) to have > well-trained crystallographers review any article that contains x-ray > diffraction data?” > > Unfortunately, the issue of crystallographic review is problematic even in > the IUCr journals, especially for powder data. A fresh instance from Acta B: > http://dx.doi.org/10.1107/S205252061500342X > where the crystal structures of alpha-Fe2O3 and alpha-Cr2O3 are > “re-refined” to be monoclinic. The monoclinic symmetry is “substantiated” > by the observation of a “complex” peak broadening that, in fact, is well > described by the anisotropic strain model available in all popular Rietveld > programs. > With such structure validation, all crystal structures may be re-refined, > potentially, to lower symmetry, as the anisotropic strain broadening is a > common powder pattern feature. > If this practice is accepted in an IUCr journal, what can we expect from > non-crystallographic literature? > > ******************************************************* > Leonid A. Solovyov > Institute of Chemistry and Chemical Technology > 660036, Akademgorodok 50/24, Krasnoyarsk, Russia > http://sites.google.com/site/solovyovleonid > ******************************************************* > > ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ > 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 Alan Hewat, NeutronOptics, Grenoble, FRANCE * <alan.he...@neutronoptics.com> +33.476.98.41.68 http://www.NeutronOptics.com/hewat ______________________________________________
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