Understanding the effect of oxide components on proton mobility in phosphate glasses using a statical analysis
Takahisa Omata1, Issei Suzuki1, Aman Sharma1
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University Katahira 2-1-1 Sendai 980-8577 Japan takahisa.omata.c2@tohoku.ac.jp +81-22-217-5832 +81-22-217-5832.
Abstract:
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 HO1/2, MgO, BaO, LaO3/2, WO3, NbO5/2, BO3/2 and GeO2 as alternative to PO5/2 were found as following. μ H at T g is determined first by concentrations of HO1/2 and PO5/2, and μ H at T g increases with increasing HO1/2 concentration and decreasing PO5/2. 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 HO1/2, MgO, BaO and LaO3/2 and BO3/2 are involved in this group. The group 2 oxides increase both μ H at T g and T g, and WO3 and GeO2 are involved in this group. The group 3 oxides increase T g but do not vary μ H at T g. Only NbO5/2 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.
