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Raman EPR and visible absorption spectra of sodium tetrasulfide in the solid state and melts have been studied from room temperature up to 300°C. The above techniques provide strong evidence for breaking of the polysulfide chains resulting in the production of S 3 -radical ions. The existence of the radical ions in polysulfides at elevated temperatures is important for understanding the electrode processes in sodium sulfur batteries.

Schwefelradikale S 3 – in Natriumtetrasulfid bei erhöhter Temperatur.: Sulfur Radical Ions S 3 – in Sodiumtetrasulfide at Elevated Temperatures