Berlin 2018 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 7: Battery Materials
MM 7.3: Talk
Monday, March 12, 2018, 12:15–12:30, H 0106
Nuclear Magnetic Resonance measurements on layered chalcogenides LiCuCh (Ch = Se, Te) — •Lena Spillecke1, Martin Valldor1, Daria Mikhailova1, Lars Giebeler1, Kwing-To Lai2, Hans-Joachim Grafe1, and Bernd Büchner1 — 1Leibniz Institute for Solid State and Materials Research, Helmholtzstraße 20, 01069 Dresden, Germany — 2Department of Physics, The Chinese University of Hong Kong, Shatin, Hong Kong, Republic of China
Nuclear Magnetic Resonance (NMR) measurements were performed on the two novel chalcogenide compounds LiCuCh (Ch = Se, Te). These layered transition metal compounds are isostructural to anti-PbClF and, thus, also isostructural to the superconducting LiFeAs compound. Several Li containing transition metal compounds have recently become a focus of research interest because of their expected performance in electrochemical battery cells. Hence, temperature dependent measurements of the spin-lattice (T1) and spin-spin (T2) relaxation times on the 7Li and the 63Cu-site of the LiCuCh compounds were performed to investigate 7Li mobility and structural changes. In LiCuTe the diffusion of 7Li-atoms set in at a temperature of 302K, corresponding to an activation energy of 0.49 eV. The activation energy can be extracted separately from T1, T2 and linewidth measurements. Furthermore, LiCuTe and LiCuSe show two inequivalent 7Li-sites which can be recognized from two differing spin-lattice relaxation times as well as from two observable peak-positions in the NMR-spectra, which is unexpected based on x-ray diffraction data.