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MA: Fachverband Magnetismus

MA 19: POSTER Ia

MA 19.17: Poster

Dienstag, 17. März 2015, 09:30–13:00, Poster A

Synthesis, structure, and magnetic properties of dilithium orthosilicates Li₂MSiO₄ (M = Fe, Mn, Ni, Co) — •Kiryl Batvinyeu¹, Christoph Neef¹, Hans-Peter Meyer², and Rüdiger Klingeler¹ — ¹Kirchhoff Institute for Physics, University of Heidelberg, Heidelberg, Germany — ²Institute of Earth Sciences, University of Heidelberg, Heidelberg, Germany

We report on the synthesis and characterization of dilithium orthosilicates Li₂MSiO₄ with M = Fe, Mn, Ni, and Co. We have obtained various polymorphs such as beta(II) (Pmn21), gamma(s) (P12₁/n1) of Li₂FeSiO₄ and gamma(II) (Pmnb), gamma(0) (P12₁/n1) of Li₂MnSiO₄ by means of solid state reactions. In all polymorphs, the transition metal ions are coordinated tetrahedrally. Our magnetic studies enable to construct the magnetic phase diagrams which are characterized by long range magnetic ordering of the respective transition metal moments in the high-spin state. The magnetic phase diagrams are discussed against the background of the actual structures, lattice parameters, and possible exchange paths.