Synthesis and investigation of novel Mn-based oxyfluoride Sr2Mn2O5-xF1+xстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A new oxyfluoride Sr2Mn2O5-xF1+x was synthesized by low temperature fluorination of Sr2Mn2O5 with XeF2 and studied using X-ray powder diffraction, electron diffraction and high resolution electron microscopy, The oxyfluoride has a tetragonal perovskite-like structure with cell parameters a = 3.8069(8) Angstrom, c = 3.989(2) Angstrom (S.G. P4/mmm). No additional superstructure or lattice distortions were detected by electron microscopy. The Mn oxidation state was evaluated using bond valence sum calculations as close to V-Mn = +3.5. The tetragonal distortion of the perovskite structure arises from the Jahn-Teller deformation of the Mn(O,F)(6) octahedra. (C) 2002 Editions scientifiques et medicales Elsevier SAS. All rights reserved.