Ionic Conductivity of AgBaSc(VO4)2 Crystals with Glaserite-Type Structure

详细

The electrical conductivity σ_dc of AgBaSc(VO₄)₂ vanadate crystals with glaserite structure (K₃Na(SO₄)₂ type, sp. gr. P\(\bar {3}\)m1) has been investigated by impedance spectroscopy in the frequency range of 5–5 × 10⁵ Hz and at temperatures from 505 to 835 K. A jump in the σ_dc value by a factor of ~2.5 is observed at 700–725 K in the σ_dc(T) curve, which indicates the existence of a first-order phase transition. The temperature range of the σ_dc jump coincides with that of the endothermic effect observed in AgBaSc(VO₄)₂ at ~723 K. The σ_dc value at 835 K is 7 × 10^–5 S/cm. The electrical conductivity mechanism is related to the Ag⁺ ion transport in the AgBaSc(VO₄)₂ lattice.