Ionic conduction of Ti0.95Mg0.05P2O7 at intermediate temperatures

In this study, intermediate temperature ionic conducting Ti0.95Mg0.05P2O7 sample was prepared by solid state reaction. The variation of conductivities as a function of atmosphere, temperatures (100–300 °C) and the pO2 pressures were studied. The highest conductivities of Ti0.95Mg0.05P2O7 are observed in dry air atmosphere to be 1.4×10−2 S cm−1 at 225 °C and in wet air atmosphere (pH2O=3.2×103 Pa) to be 2.0×10−2 S cm−1 at 200 °C, respectively. The logσ–log(pO2) plot result indicates that Ti0.95Mg0.05P2O7 is almost a pure ionic conductor under high oxygen partial pressure and a mixed conductor of ion and electron under low oxygen partial pressure. The result of water vapor concentration cells indicate that the sample has a few existence of oxide ionic conduction under wet H2 atmosphere and mainly protonic conduction under wet O2 atmosphere.