Rapid Li Ion Dynamics in the Interfacial Regions of Nanocrystalline Solids

S. Breuer, M. Uitz, H. M.R. Wilkening

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Diffusive processes are ubiquitous in nature. In solid state physics, metallurgy and materials science the diffusivity of ions govern the functionality of many devices such as sensors or batteries. Motional processes on surfaces, across interfaces or through membranes can be quite different to that in the bulk. A direct, quantitative description of such local diffusion processes is, however, rare. Here, we took advantage of 7Li longitudinal nuclear magnetic relaxation to study, on the atomic length scale, the diffusive motion of lithium spins in the interfacial regions of nanocrystalline, orthorhombic LiBH4. Magnetization transients and free induction decays revealed a fast subset of Li ions having access to surface pathways that offer activation barriers (0.18 eV) much lower than those in the crystalline bulk regions (0.55 eV). These observations make orthorhombic borohydride a new nanostructured model system to study disorder-induced enhancements in interfacial diffusion processes.

Original languageEnglish
Pages (from-to)2093-2097
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume9
Issue number8
DOIs
Publication statusPublished - 19 Apr 2018

ASJC Scopus subject areas

  • Materials Science(all)

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