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On the electrodeposition of coherent gadolinium dendrites from molten fluoride electrolytes

Zur elektrochemischen Abscheidung kohärenter Gadoliniumdendriten aus geschmolzenen Fluoridelektrolyten

  • Inorganic and Physical Chemistry
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Monatshefte für Chemie / Chemical Monthly Aims and scope Submit manuscript

Abstract

The morphology of gadolinium dendrites deposited in molten fluorides may be linked with the stability of electroactive associates.

Quantum chemical calculations of moieties, based on the solid state structure of GdF3, reveal an increased overall stabilizing attraction in the following order:

$$Gd_{1 - x} Ba_x F_{3 - x}< GdF_3< Gd_{1 - x} F_{3 - 2x} O_x< Gd_{1 - x} Ca_x F_{3 - x} $$

The stabilization of the 75 LiF-25 mol% GdF3 electrolyte by oxyfluorocomplexes led to the deposition of essentially pure gadolinium dendrites. The fluorine contamination caused by salt inclusions was consequently reduced from the 1,500–2,000 ppm, as obtained in the pure LiF-GdF3 electrolyte, to less than 3 ppm.

Zusammenfassung

Die Morphologie aus Fluoridschmelzen abgeschiedener Gadoliniumdendriten läßt sich mit der Stabilität elektroaktiver Assoziate korrelieren.

Quantenchemische Berechnungen von Assoziaten, deren Struktur auf jener des kristallisierten GdF3 aufbauen, ergeben eine zunehmende Stabilisierung in der Folge

$$Gd_{1 - x} Ba_x F_{3 - x}< GdF_3< GdF_{3 - 2x} O_x< Gd_{1 - x} Ca_x F_{3 - x} $$

Durch die Stabilisierung des 75 LiF-25 mol% GdF3-Elektrolyten mittels Oxyfluorokomplexen konnte eine nahezu vollständige Kohärenz der abgeschiedenen Gadoliniumdendriten erreicht werden. Die durch Salzeinschlüsse bedingte Fluorkonzentration im gewonnenen Gadoliniummetall nahm dementsprechend von 1500–2000 ppm (LiF-GdF3-Elektrolyt ohne Zusätze) auf <3 ppm ab.

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Zwilling, G. On the electrodeposition of coherent gadolinium dendrites from molten fluoride electrolytes. Monatshefte für Chemie 112, 33–41 (1981). https://doi.org/10.1007/BF00906240

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