Understanding the effect of oxide components on proton mobility in phosphate glasses using a statical analysis approach.

The models to describe the proton mobility ( μ H ) together with the glass transition temperature ( T g ) of proton conducting phosphate glasses employing the glass composition as descriptors have been developed using a statical analysis approach. According to the models, the effects of additional HO 1/2 , MgO, BaO, LaO 3/2 , WO 3 , NbO 5/2 , BO 3/2 and GeO 2 as alternative to PO 5/2 were found as following. μ H at T g is determined first by concentrations of HO 1/2 and PO 5/2 , and μ H at T g increases with increasing HO 1/2 concentration and decreasing PO 5/2 . The component oxides are categorized into three groups according to the effects on μ H at T g and T g . The group 1 oxides increase μ H at T g and decrease T g , and HO 1/2 , MgO, BaO and LaO 3/2 and BO 3/2 are involved in this group. The group 2 oxides increase both μ H at T g and T g , and WO 3 and GeO 2 are involved in this group. The group 3 oxides increase T g but do not vary μ H at T g . Only NbO 5/2 falls into the group 3 among the oxides examined in this study. The origin of the effect of respective oxide groups on μ H at T g and T g were discussed.