Issue 21, 2016

Mechanochemically synthesized fluorides: local structures and ion transport


The performance of new sensors or advanced electrochemical energy storage devices strongly depends on the active materials chosen to realize such systems. In particular, their morphology may greatly influence their overall macroscopic properties. Frequently, limitations in classical ways of chemical preparation routes hamper the development of materials with tailored properties. Fortunately, such hurdles can be overcome by mechanochemical synthesis. The versatility of mechanosynthesis allows the provision of compounds that are not available through common synthesis routes. The mechanical treatment of two or three starting materials in high-energy ball mills enables the synthesis not only of new compounds but also of nanocrystalline materials with unusual properties such as enhanced ion dynamics. Fast ion transport is of crucial importance in electrochemical energy storage. It is worth noting that mechanosynthesis also provides access to metastable phases that cannot be synthesized by conventional solid state synthesis. Ceramic synthesis routes often yield the thermally, i.e., thermodynamically, stable products rather than metastable compounds. In this perspective we report the mechanochemical synthesis of nanocrystalline fluorine ion conductors that serve as model substances to understand the relationship between local structures and ion dynamics. While ion transport properties were complementarily probed via conductivity spectroscopy and nuclear magnetic relaxation, local structures of the phases prepared were investigated by high-resolution 19F NMR spectroscopy carried out by fast magic angle spinning. The combination of nuclear and non-nuclear techniques also helped us to shed light on the mechanisms controlling mechanochemical reactions in general.

Graphical abstract: Mechanochemically synthesized fluorides: local structures and ion transport

Article information

Article type
09 Mar 2016
22 Apr 2016
First published
26 Apr 2016
This article is Open Access
Creative Commons BY license

Dalton Trans., 2016,45, 8675-8687

Author version available

Mechanochemically synthesized fluorides: local structures and ion transport

F. Preishuber-Pflügl and M. Wilkening, Dalton Trans., 2016, 45, 8675 DOI: 10.1039/C6DT00944A

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