Low-temperature properties of nuclear spin relaxation in inorganic glasses

A number of basic scientific questions relating to ion conduction in homogeneously disordered solids are discussed. The questions deal with how to define the mobile ion density, what can be learned from electrode effects, what is the ion transport mechanism, the role of dimensionality, and what are the origins of the mixed-alkali effect, of time-temperature superposition, and of the nearly-constant loss. Answers are suggested to some of these questions, but the main purpose of the paper is to draw attention to the fact that this field of research still presents several fundamental challenges.

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“…154 On a microscopic level this could correspond to cooperative "jellyfish-type" movements of groups of atomic species in the material.…”

Section: What Causes the Nearly Constant Loss?mentioning

confidence: 99%

Fundamental questions relating to ion conduction in disordered solids

et al. 2009

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“…It is immediately evident that there are two relaxation mechanisms responsible for the observed results. At low temperature the time-dependent fluctuations believed to be responsible for the spin-lattice relaxation are due to localized low frequency excitations (LFEs) [133,379,380] arising from disorder modes characteristic of the glassy state.…”

Section: Spin-lattice Relaxationmentioning

confidence: 99%

Solid-state Li NMR with applications to the translational dynamics in ion conductors

Böhmer

Jeffrey

Vogel

2007

Progress in Nuclear Magnetic Resonance Spectroscopy

225

232

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“…The field dependence of T 1 likely shows the discreteness of the (broadened) energy levels. In glassy networks [19,20], where relaxation is believed to proceed via two level systems, the relaxation rate goes as 1/T 1 ∝ T η B −m with 1.1 ≤ η ≤ 1.5 and 0.6 ≤ m ≤ 1.2. Such a behavior has also been observed in some cluster compounds [10].…”

Section: Discussionmentioning

confidence: 99%

NMR in powders and single crystals of the metal-alloy cluster [HNi38Pt6(CO)48]5-

Brom

Klink

Fritschij

et al. 1997

Z Phys D - Atoms, Molecules and Clusters

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The 44 atom core Ni38Pt6 in the metal cluster compound [HNi 38 Pt 6 (CO) 48 ] 5− is the largest metal atom core, that has been realized in a single crystal. By 195 Pt NMR we have studied the electron density at the Pt-core atoms in powders and single crystals of two varieties of this compound. The large line widths can be explained by charge fluctuations between the metal cores, which are about 17Å apart. The relaxation rates, which resemble those in randomly-packed Pt309 cluster compounds, confirm such an interpretation.

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Low-temperature properties of nuclear spin relaxation in inorganic glasses

Cited by 64 publications

References 20 publications

Fundamental questions relating to ion conduction in disordered solids

Fundamental questions relating to ion conduction in disordered solids

Solid-state Li NMR with applications to the translational dynamics in ion conductors

NMR in powders and single crystals of the metal-alloy cluster [HNi38Pt6(CO)48]5-

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