Paulus M C, Paulus A, Schleker P P M, Jakes P, Eichel R-A, Heitjans P, Granwehr J
Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-9), D-52425 Jülich, Germany; RWTH Aachen University, Institute for Technical and Macromolucular Chemistry (ITMC), D-52074 Aachen, Germany; Forschungszentrum Jülich GmbH, Helmholtz Institute Münster (HI-MS) - Ionics in Energy Storage (IEK-12), 48149 Münster, Germany.
Forschungszentrum Jülich GmbH, Institute for Energy and Climate Research (IEK-9), D-52425 Jülich, Germany; RWTH Aachen University, Institute for Physical Chemistry (IPC), D-52074 Aachen, Germany.
J Magn Reson. 2019 Jun;303:57-66. doi: 10.1016/j.jmr.2019.04.006. Epub 2019 Apr 11.
This contribution addresses the experimental proof of the relaxation coupling of the Li (I = 3/2) longitudinal magnetization orders in the solid-state electrolyte LiGePS (LGPS). This effect was theoretically described by Korb and Petit in 1988 but has not yet been shown experimentally. In a 2D-T/spin-alignment echo (SAE) experiment, the inverse Laplace transformation of the spectral component over two time dimensions revealed the asymmetric course of the spin-lattice relaxation following from the coupling of all longitudinal orders. These observations were supported by Multi-quantum-filter experiments and by simulations of the 2D-T/SAE experiment with a lithium spin system. Since the asymmetric relaxation effects are directly dependent on the velocities and degrees of freedom of ion motion they could be used especially in fast Li-ion conductors as a separation tool for environments with different mobility processes.
本文论述了固态电解质LiGePS（LGPS）中Li（I = 3/2）纵向磁化序弛豫耦合的实验证明。这种效应在1988年由科尔布和佩蒂进行了理论描述，但尚未得到实验验证。在二维T/自旋排列回波（SAE）实验中，通过对两个时间维度上光谱分量的拉普拉斯逆变换，揭示了所有纵向序耦合导致的自旋-晶格弛豫的不对称过程。多量子滤波实验以及对锂自旋系统二维T/SAE实验的模拟均支持了这些观察结果。由于不对称弛豫效应直接取决于离子运动的速度和自由度，因此它们尤其可用于快速锂离子导体，作为区分具有不同迁移过程环境的工具。
