Oxynitride phosphate glasses were obtained by ammonolysis of xLi2O (1−x)P2O5 (x = 0.5, 0.55, 0.575) glasses and their electrical conductivity and Li structural environment studied. Nitrided glasses were prepared through thermal treatment of the phosphate glasses under ammonia flow at temperatures below 800C. Nitrogen incorporation produces a sharp increase in conductivity for low N contents, while the activation energy decreased. Conductivity increase was very small or negligible for N/P ratios higher than 0.1, and the effect of N was analogous for all Li/P ratios. The increase in the electrical conductivity was explained through the structural modifications produced after the N substitution within the glass network. 6Li nuclear magnetic resonance experiments show that the coordination number of Li+ decreased with N/P, which was interpreted as an increase in the Li–O bonds covalence. This effect of N on the Li environment together with the increased glass density was thought to be counteracting the increase of conductivity for high N contents.

Increased Electrical Conductivity of LiPON Glasses Produced by Ammonolysis. F.Muñoz, A.Durán, L.Pascual, L.Montagne, B.Revel, A.C.M.Rodrigues: Solid State Ionics, 2008, 179[15-16], 574-9