A series of glassy electrolytes in the ternary system (100 ？ x)(3K2S ？ 7P2S5) ？ xKI (x = 0, 5, 10, 15 and 20) was investigated, with a focus on their potassium-ion conductivity using electrochemical impedance spectroscopy (EIS). Among the compositions studied, the electrolyte with x = 20 exhibited the highest ambient-temperature conductivity, measured at 2.36 ？？ 10？10 S？cm？1. The materials were characterized by XRD, DSC, and Raman spectroscopy. DSC results revealed glass transition temperatures just above 130？C; therefore, temperature-dependent conductivity measurements were performed within the range of 21？C - 125？C to determine activation energies without interference from thermal transitions. Raman spectroscopic analysis confirmed the presence of invariant structural units of the network former—
—across all glassy electrolytes. The similarity of vibrational modes to those of the parent composition indicates that halide ions do not interact chemically with these network-forming units. Instead, the halide ions occupy interstitial sites within the glass structure. The observed increase in ionic conductivity with higher KI content is attributed to a rise in charge carrier concentration, consistent with the interstitial incorporation of halide ions without disrupting the anionic framework.
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