Abstract
Phosphate glasses with the compositions 40P2O5–10MnO2–(50–x)Li2O–xK2O (x = 5, 15, 25, 35, and 45 mol%) have been prepared by the conventional melt quenching technique. X-ray diffraction (XRD) patterns confirmed the amorphous nature of the samples. Elemental analysis of the glasses has been performed by X-ray fluorescence (XRF) spectroscopy. The mixed alkali effect (MAE) on the structural, physical, and electrical properties of the present glassy systems has been investigated. A nonlinear variation in density upon the incremental replacement of Li2O by K2O corroborated the operation of an MAE in modulating the structural properties. Fourier-transform infrared (FTIR) spectra revealed that the structures are mainly composed of metaphosphate and pyrophosphate units. Differential scanning calorimetry (DSC) has been performed to investigate the thermal behavior of the samples and to determine their glass transition temperatures (Tg). DC electrical conductivity increased with increasing temperature, which proved the semiconducting nature of the glasses. It was found that ionic conductivity plays a greater role in determining the electrical properties of the systems than electronic conductivity.
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