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