TIN(II)-CONTAINING FLUORIDE ION CONDUCTORS: HOW TIN MULTIPLIES THE FLUORIDE ION CONDUCTION BY UP TO THREE ORDERS OF MAGNITUDE

Electrical conduction by the motion of ions in the solid state was considered to be impossible for a long time. When Michael Faraday discovered that solid lead(II) fluoride conducts electricity when heated, it was an anomaly and the conduction mechanism remained ununderstood for long. Nowadays, seve...

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Bibliographic Details
Published inWIT Transactions on Engineering Sciences Vol. 133; p. 167
Main Authors DÉNÈS, GEORGES, MUNTASAR, ABDUALHAFED, Madamba, M Cecilia, Parris, Juanita M
Format Journal Article
LanguageEnglish
Published Southampton W I T Press 01.01.2021
Subjects
Bonding
Conductors
Crystal structure
Electrical conduction
Fluoridation
Fluorides
Fluorine
Interlayers
Mossbauer spectroscopy
Rechargeable batteries
Solid electrolytes
Solid state
Thermal stability
Tin
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ISSN1746-4471
1743-3533
DOI10.2495/MC210181

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Summary:Electrical conduction by the motion of ions in the solid state was considered to be impossible for a long time. When Michael Faraday discovered that solid lead(II) fluoride conducts electricity when heated, it was an anomaly and the conduction mechanism remained ununderstood for long. Nowadays, several ions of small size and low charge, such as H+, Li+ and F–, are known to be highly mobile in solid compounds provided the crystal structure contains pathways that make possible easy ionic motion. We have prepared new compounds, PbSnF4 and BaSnF4 and other phases in the PbF2-SnF2 system that increase the conduction efficiency by up to three orders of magnitude relative to the corresponding MF2. Solid state fluoride ion batteries (FIBs) promise high specific energy and thermal stability. High potential solid state rechargeable fluoride ion batteries are being designed and BaSnF4 has been used as one of the ingredients to form an interlayer solid electrolyte with high conductance. In the current work, we have analyzed the role of divalent tin in these structures, in terms of crystal structure and of local bonding to fluorine, in an effort to understand how it can result in such a high enhancement of the conductivity. Diffraction methods were used to investigate the crystal structures and 119Sn Mössbauer spectroscopy for studying the mode of Sn-F bonding and the electron configuration of tin.
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ISSN:1746-4471
1743-3533
DOI:10.2495/MC210181