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Lithium–Lead–Bismuth phosphates glasses having, a composition 30Li3PO4–(70−x)Pb3(PO4)2–xBiPO4 (45≤x≤60mol%) were prepared by using the melt quenching method 1000°C. The thermal stability of theses glasses increases with the substitution of Bi2O3 with PbO. The ionic conductivity of all compositions have been measured over a wide temperature (200–500°C) and frequency range (1–106Hz). The ionic conductivity...