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MM: Fachverband Metall- und Materialphysik

MM 10: Functional materials II: Battery Materials

MM 10.3: Talk

Monday, March 16, 2015, 12:15–12:30, TC 010

Single crystal growth, magnetism and ionic conductivity of LiMn_1−xFe_xPO₄ — •Christoph Neef¹, Hubert Wadepohl², Hans-Peter Meyer³, and Rüdiger Klingeler¹ — ¹Kirchhoff Institut für Physik, Universität Heidelberg, D-69120 Heidelberg — ²Anorganisch-Chemisches Institut, Universität Heidelberg, D-69120 Heidelberg — ³Institut für Geowissenschaften, Universität Heidelberg, D-69120 Heidelberg

Single crystals LiMn_1−xFe_xPO₄ were grown using the optical floating zone technique at elevated argon pressure up to 30 bar. The resulting mm-sized single crystals were used to study the influence of Fe doping on the structural, magnetic and transport properties by means of single crystal XRD, thermal expansion, magnetometry, and impedance spectroscopy. The resulting phase diagram illustrates the evolution of the long range antiferromagnetically ordered ground state for different doping levels. The ionic conductivity which is of particular interest for application of the material in Li-ion batteries is very low in the end member LiMnPO₄ but clearly increases upon Fe doping.