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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Ed. by Rademann, Klaus

12 Issues per year


IMPACT FACTOR 2016: 1.012

CiteScore 2016: 0.99

SCImago Journal Rank (SJR) 2016: 0.463
Source Normalized Impact per Paper (SNIP) 2016: 0.470

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2196-7156
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Volume 226, Issue 5-6 (Jun 2012)

Issues

Li Ion Dynamics in Al-Doped Garnet-Type Li7La3Zr2O12 Crystallizing with Cubic Symmetry

Alexander Kuhn / Joon-Yong Choi
  • 1 Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Jülich, Deutschland
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/ Lars Robben / Frank Tietz
  • 3 Forschungszentrum Jülich GmbH, Institute of Energy and Climate Research, Jülich, Deutschland
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/ Martin Wilkening
  • 4 Leibniz University Hannover, Institute of Phys. Chemistry and Electrochemistry, Hannover, Deutschland
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/ Paul Heitjans
  • 5 Universität Hannover, Institut f. Physikalische Chemie und Elektrochemie, Hannover, Deutschland
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Published Online: 2012-06-18 | DOI: https://doi.org/10.1524/zpch.2012.0250

Abstract

Lithium-ion dynamics in the garnet-type solid electrolyte “Li7La3Zr2O12” (LLZ) crystallizing with cubic symmetry was probed by means of variable-temperature 7Li NMR spectroscopy and ac impedance measurements. Li jump rates of an Al-containing sample follow Arrhenius behaviour being characterized by a relatively high activation energy of 0.54(3) eV and a pre-exponential factor of 2.2(5) × 1013 s-1. The results resemble those which were quite recently obtained for an Al-free LLZ sample crystallizing, however, with tetragonal symmetry. Hence, most likely, the significantly higher Li conductivity previously reported for a cubic LLZ sample cannot be ascribed solely to the slight structural distortions accompanying the change of the crystal symmetry. Here, even Al impurities, acting as stabilizer for the cubic polymorph at room temperature, do not lead to the high ion conductivity reported previously.

Keywords: Solid Electrolytes; Garnets; Lithium Ion Dynamics; NMR; Spin-Lattice Relaxation

About the article

* Correspondence address: Leibniz University Hannover, Institute of Phys. Chemistry and Electrochemistry, Callinstraße 3-3a, 30167 Hannover, Deutschland,


Published Online: 2012-06-18

Published in Print: 2012-06-01


Citation Information: Zeitschrift für Physikalische Chemie, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1524/zpch.2012.0250.

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