Reversible Electrochemical Intercalation and Deintercalation of Fluoride Ions into Host Lattices with Schafarzikite-Type Structure.

Herein, we report the successful electrochemical fluorination and defluorination of schafarzikite-type compounds with the composition Fe m SbO (M=Mg or Co). We show that electrochemical methods can present a more controllable and less environmentally damaging route for fluorinating compounds in contrast to traditional methods that involve heating samples in F-rich atmospheres. The reactivity of the host lattices with fluoride during electrochemical fluorination makes this material an interesting candidate for fluoride-ion battery applications.

Topotactic Fluorine Insertion into the Channels of FeSbO-Related Materials.

This paper discusses the fluorination characteristics of phases related to FeSbO, by reporting the results of a detailed study of MgFeSbO and CoFeSbO. Reaction with fluorine gas at low temperatures (typically 230 °C) results in topotactic insertion of fluorine into the channels, which are an inherent feature of the structure. Neutron powder diffraction and solid state NMR studies show that the interstitial fluoride ions are bonded to antimony within the channel walls to form Sb-F-Sb bridges.

Oxygen Insertion Reactions within the One-Dimensional Channels of Phases Related to FeSbO.

The structure of the mineral schafarzikite, FeSbO, has one-dimensional channels with walls comprising Sb cations; the channels are separated by edge-linked FeO octahedra that form infinite chains parallel to the channels. Although this structure provides interest with respect to the magnetic and electrical properties associated with the chains and the possibility of chemistry that could occur within the channels, materials in this structural class have received very little attention. Here we show, for the first time, that heating selected phases in oxygen-rich atmospheres can result in relatively large oxygen uptakes (up to ∼2% by mass) at low temperatures (ca.

LiSbO2: synthesis, structure, stability, and lithium-ion conductivity.

LiSbO(2) has been synthesized using a ceramic method involving evacuated quartz tubes to ensure stoichiometry. Its structure [monoclinic, P2(1)/c; a = 4.8550(3) Å, b = 17.