Berlin 2015 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 10: Functional materials II: Battery Materials
MM 10.3: Vortrag
Montag, 16. März 2015, 12:15–12:30, TC 010
Single crystal growth, magnetism and ionic conductivity of LiMn1−xFexPO4 — •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 LiMn1−xFexPO4 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.