Dresden 2017 – scientific programme
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MA: Fachverband Magnetismus
MA 66: Poster 3
MA 66.13: Poster
Friday, March 24, 2017, 09:30–13:00, P2-OG2
Single crystal growth and structure of Li2Fe1−xMnxSiO4 — •Hagen Schray1, Christoph Neef1, Hubert Wadepohl2, and Rüdiger Klingeler1 — 1Kirchhoff Institut für Physik, Universität Heidelberg, 69120 Heidelberg, Deutschland — 2Anorganisch-Chemisches Institut, Universität Heidelberg, 69120 Heidelberg, Deutschland
Li2Fe1−xMnxSiO4 single crystals were grown by means of the optical floating zone technique at elevated Ar-pressure of up to 50 bar. The growth parameters and in particular the effect of pressure are discussed with respect to Mn-doping and the oxygen stoichiometry of the system. The microstructure of the grown single crystals and crystallites was studied by EDX and electron microscopy. A mm3 sized Li2FeSiO4 single crystal was successfully obtained which features the known high temperature structure with Pnmb-symmetry. Single crystal and powder XRD were applied to study the doping series Li2Fe1−xMnxSiO4 and to refine the structure of the end member Li2FeSiO4 in detail. For this crystal, magnetic studies confirm high crystallinity showing up in a λ-type antiferromagnetic transition at TN=17 K and evidence for magnetic correlations up to ≤50 K.