Electron paramagnetic resonance, infrared, and electrical conductivity studies of γ-ray irradiated Li2SO4-K2SO4 mixed system

Abstract Electron paramagnetic resonance spectra of 7-irradiated Li:2SO4-K2SO4 mixed system are measured at X-band and 300 K. Two types of centers, A and B, identified as LiOH+ 2 and SO− 3 are studied. The EPR spectrum of LiOH+ 2 has a well-resolved hyperfine structure. The effective g-value and the hyperfine structure constant of it are calculated. On the other hand, the SO− 3 center is characterized by an intense isotropic signal at a g-value ≈ 2. 0035. Mechanisms of center formation are proposed. Infrared transmittance spectra were recorded for unirradiated and γ-ray irradiated samples. A decrease in the transmittance spectra was observed after irradiation. The ionic conductivity, σ, has been measured for the Li2SO4-K2SO4 system before and after irradiation in the temperature range 30–400°C. The activation energy was found to be 1. 1 eV. A considerable decrease in the conductivity value accompanied by an increase in the activation energy was observed after γ-irradiation.

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