Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 66: Poster 3

MA 66.13: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG2

Single crystal growth and structure of Li₂Fe_1−xMn_xSiO₄ — •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

Li₂Fe_1−xMn_xSiO₄ 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 Li₂Fe_1−xMn_xSiO₄ 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 T_N=17 K and evidence for magnetic correlations up to ≤50 K.