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TT: Fachverband Tiefe Temperaturen

TT 19: Poster Session: Correlated Electrons 1

TT 19.58: Poster

Montag, 20. März 2017, 15:00–19:00, P2-EG

Electrochemical Characterization and Valence Tuning of Lithium Nitridometallates — •Elisa Thauer¹, Alex Ottmann¹, Christoph Neef¹, Manuel Fix², Anton Jesche², and Rüdiger Klingeler¹ — ¹Kirchhoff Institut für Physik, Universität Heidelberg, D-69120 Heidelberg, Germany — ²Experimentalphysik VI, Institut für Physik, Universität Augsburg, D-86135 Augsburg, Germany

The electrochemical properties of lithium metal nitrides Li₂Li_1−xM_xN with M = Fe or Ni and of Li₃N are investigated by cyclic voltammetry and galvanostatic cycling. Based on these results, the lithium content and thus the valence of the transition metal ions is altered electrochemically. In addition to XRD studies on the electrochemically treated materials, the effect of delithiation on the magnetic properties is studied by means of SQUID magnetometry. For Li_2.7Fe_0.3N, electrochemical tuning yields suppression of the initial hard magnetic ground state. In the case of Li_2.6Ni_0.4N, the paramagnetic response diminishes upon delithiation. Finally, we show perspectives for delithiation procedures in Li₃N.